fix(CreateOpenProjectGUI): fix broken file chooser directory memory and remove dead code

[AmlanDalai]

Changes

1. Removed dead code (line 70)

setDefaultCloseOperation(EXIT_ON_CLOSE) was immediately overwritten
by setDefaultCloseOperation(DO_NOTHING_ON_CLOSE) on the next line.
Removed the dead first call.

2. Fixed file chooser "remember directory" bug (lines 133-137)

The currentDir check was placed AFTER showOpenDialog(), meaning
the dialog had already closed by the time we tried to set the directory.

Before: File chooser always opened at default directory
After: File chooser remembers and opens at the last-used directory

Fix details

• Moved currentDir check BEFORE showOpenDialog()
• Changed setSelectedFile() to setCurrentDirectory(currentDir.getParentFile())
  for proper directory navigation

Testing

• Verified exit confirmation dialog still works correctly after removing dead code
• Verified file chooser now remembers the last directory after opening a file
• Verified 0 compilation errors