fix(linux): preserve display name in .desktop file generation

[leaanthony]

Description

GenerateDotDesktop was calling normaliseName() on the Name field, which lowercased it and replaced spaces with dashes. This altered the Name= value in the generated .desktop entry, affecting how the app appears in Linux desktop menus.

The Name field in a .desktop file should be the human-readable display name per the FreeDesktop spec. Only the output filename needs to be normalized.

Before:

wails3 generate .desktop -name "My app" -exec "my-app"
# → Name=my-app (incorrect)

After:

wails3 generate .desktop -name "My app" -exec "my-app"
# → Name=My app (correct, as per FreeDesktop spec)

Fixes #5072

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Manual verification of the generated output
• No existing tests for this function

Checklist:

• My code follows the general coding style of this project
• My changes generate no new warnings

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