Fix mouse positioning when UI is scaled

[MilosRasic]

Summary

Bugfixes "Fix mouse positioning when UI is scaled"

Purpose of change

Fixes #80724

Also fixes a similar problem where the mouse view is showing details for the wrong tile when the UI is scaled.

Describe the solution

When the UI is scaled, both input_context::get_coordinates_text() and the override of input_context::get_coordinates() in sdltiles.cpp ends up working with a mix of physical and logical coordinates and dimensions. The fix is to normalise everything to logical values before performing calculations.

The logic gets a little more complicated because terrain and overmap are already in logical sizes and don't need the adjustment.

Describe alternatives you've considered

None, although I did wonder why input_context::get_coordinates() is overridden in sdltiles.cpp and input_context::get_coordinates_text() uses #if !defined( TILES )..#else

Testing

Loaded and game with 2x scaling and:

• Verified that mouse view is working properly
• That move by clicking on terrain is not broken
• Mouse hover and click in the inventory and activate menus are working properly
• Mouse click in the overmap is working properly
• Main menus like world creation and options are working properly

Repeated the same with no scaling to verify it's not broken by the fix.

Additional context

none