Always reset columns sizes after showing selected molecules
Always reset columns sizes after showing selected molecules

This updates the main window to always resize the table columns
to the proper size. Previously it was only done when activating
the show selected molecules mode.

Change-Id: Ia804d09ff56a8fdb430967d16ac5a5293d363a0e

OpenChemistry/mongochem,OpenChemistry/mongochem,OpenChemistry/mongochem