[bisq-network/bisq] Remove outliers when calculating BSQ rate (#4706)

[Stan]

When I click the DAO menu, I get a jfoenix / reflection related NPE:

```
Oct-29 17:48:40.603 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Uncaught Exception from thread JavaFX Application Thread 
Oct-29 17:48:40.603 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableMessage= null 
Oct-29 17:48:40.603 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableClass= class java.lang.NullPointerException 
Oct-29 17:48:40.604 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Stack trace:
java.lang.NullPointerException
	at bisq.desktop.components.JFXTextFieldSkinBisqStyle.updateTextPos(JFXTextFieldSkinBisqStyle.java:95)
	at bisq.desktop.components.JFXTextFieldSkinBisqStyle.layoutChildren(JFXTextFieldSkinBisqStyle.java:79)
	at javafx.scene.control.Control.layoutChildren(Control.java:601)
	at javafx.scene.Parent.layout(Parent.java:1204)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.scene.Scene.doLayoutPass(Scene.java:576)
	at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2482)
	at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
	at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411)
	at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:519)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:499)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:492)
	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:320)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
	at java.base/java.lang.Thread.run(Thread.java:835)

```

It's happened after three startups -- two of them on a fresh data directory.  I do think it is related to the current `jfoenix-9.0.6.jar` imcompatibility with JDK 11+, in combination with this change.

I am using OpenJDK 12 on Ubuntu 12.

Related PRs:  https://github.com/bisq-network/bisq/pull/4443    https://github.com/bisq-network/bisq/pull/4463  https://github.com/bisq-network/bisq/pull/4242   


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