fix(desktop): cannot open filename with spaces using OS file manager #33161

Problem:
When activated from OS "filetype handling", Nvim cannot handle filenames containing spaces.

Solution:
Quote the filename in the .desktop config.

(cherry picked from commit 6e12ef4a7b)

runtime/nvim.desktop

@@ -78,7 +78,7 @@ Comment[wa]=Asspougnî des fitchîs tecses
 Comment[zh_CN]=编辑文本文件
 Comment[zh_TW]=編輯文字檔
 TryExec=nvim
-Exec=nvim %F
+Exec=nvim "%F"
 Terminal=true
 Type=Application
 Keywords=Text;editor;