[bisq-network/bisq] Executable flag needed for scripts (Issue #5873)

[Stephan Oeste]

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### Description

<!-- brief description of the bug -->

All .sh files in directory ```scripts/``` need the executable (+x) flag

#### Version

master
<!-- commit id or version number -->

### Steps to reproduce

Install script for a seednode fails because it cant execute ```scripts/install_java_linux.sh```


<!--if you can reliably reproduce the bug, list the steps here  -->

### Expected behaviour

```
# ./install_seednode_debian.sh
...
[*] Installing Bitcoin into OS
[*] Installing Bitcoin configuration
[*] Generating Bitcoin RPC credentials      
[*] Installing Bitcoin init scripts
[*] Creating Bisq user with Tor access
[*] Creating Bisq homedir
[*] Moving Bisq repo
[*] Installing OpenJDK 11.0.2 from Bisq repo 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  178M  100  178M    0     0  97.4M      0  0:00:01  0:00:01 --:--:-- 97.3M
Java has been installed in /usr/lib/jvm/openjdk-11.0.2
...
```

<!--description of the expected behavior -->

### Actual behaviour

```
# ./install_seednode_debian.sh
....
[*] Installing Bitcoin into OS
[*] Installing Bitcoin configuration
[*] Generating Bitcoin RPC credentials
[*] Installing Bitcoin init scripts
[*] Creating Bisq user with Tor access
[*] Creating Bisq homedir
[*] Moving Bisq repo
[*] Installing OpenJDK 11.0.2 from Bisq repo
-bash: /bisq/bisq/scripts/install_java_linux.sh: Permission denied
```

<!-- explain what happened instead of the expected behaviour -->

### Screenshots

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#### Device or machine

<!-- device/machine used, operating system -->



#### Additional info

<!-- Additional information useful for debugging (e.g. logs) -->


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https://github.com/bisq-network/bisq/issues/5873
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