Changed signal/slot connections to avoid override of accept() method

Fixed connections so that settings are applied when the OK or Apply
buttons are clicked.  The dialog closes only when the OK button is
clicked. The result code returned when calling exec() is also correct.

Change-Id: Ibc84998b6d43535f7f0f1a2fa1f5d9272b0b1028
Merge topic 'fix_apply_pqProxyWidgetDialog' into next

76fae897 Changed signal/slot connections to avoid override of accept() method