[bisq-network/bisq] Add colon after paymentMethod on tooltip (#3619)

[Pac]

Sorry, I made a little confusion...
My first change was a silly change to add a colon missing in a tooltip.
This was my first ever pull request, I am a total noob with github.
Later, I think I found the bug that causes issue #3601 
The bug only happens when the offer has min-max value range.
The new `isAmountValidForOffer` in `PaymentAccountUtil.java` consider only the max amount, but the button to take the offer is ungrayed considering the min amount, which causes the bug.
Both fixes came together here, I don't really know how should I have done it to make them separate.

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