Opening Puzzle Bug Fixes

[19690ao]

Description

From within the proof and puzzle editors, it wasn't possible to open a new puzzle. Now, opening a puzzle from within an editor should have the intended effect of opening a puzzle.

The ActionListener had the wrong function attached to it.

Closes #410
Closes #174

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an already existing feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

I opened multiple files from either editor in succession.

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[charlestian23]

Changes are good