Switching breakpoint condition should preserve the condition in breakpoint widget

[isidorn]

Originaly from @rkeithhill

For me, the only issue that exists here is that the dropdown UI does not save the current value when switching between Expression and Hit Count. I know the watermark text says to hit press Enter but I think a fair number or folks will type an Expression, hit the drop down to set the Hit Count, then they press Enter. In this scenario only the Hit Count is accepted. The condition expression is not.

[isidorn]

To verify: enter both condition and hit condition for a breakpoint and make sure both get applied.

fyi @rkeithhill this is now fixed