chore: Move Linux-only configs out of "common" and into "linux"

common/.config/kate/externaltools/Clang%20Format%20Selected%20Text.ini

@@ -1,13 +0,0 @@
-[General]
-actionName=externaltool_ClangFormatSelectedText
-arguments=-assume-filename=%{Document:FileName}
-category=Tools
-cmdname=clang-format-selection
-executable=clang-format
-input=\s%{Document:Selection:Text}
-name=Clang Format Selected Text
-output=ReplaceSelectedText
-reload=false
-save=None
-trigger=None
-workingDir=%{Document:Path}