Wrong widget traversal order

I believe the bug existed in all versions.

In all Sequence View dialogs, pressing Tab doesn't correspond to the visible order of widgets. We need to fix it or justify why this cannot be done.

Example scenario:

1. Open human_T1.
   Expected: SV appears.
2. Click the "Find pattern [Smith-Waterman]" button on the Global actions toolbar.
   Expected: the "Smith-Waterman Search" dialog appears.
3. Press Tab several times and check how the focus changes:
4. Based on the dialog layout, the traversal order is expected to be as follows:
   1. Widget for editing the line "Enter pattern here"
   2. Group of buttons "Search in"
   3. Group of buttons "Strand"
   4. Region widgets
   5. Combo box "Algorithm version"
5. but after "Strand" the focus doesn't go to the Region.

And so on for all Global Sequence View Action dialogs.