Capitalize drive letters on windows

Waqar Ahmedrequested to merge
work/capitalize_drive_letter_on_windows into master

Capitalize the drive letter on windows. Our documents always have capital letter because KateDocManager uses Utils::absoluteUrl() which reconstructs the url using QFileInfo::absolouteFilePath() which returns a captialized drive letter according to Qt docs.

BUG: 509085

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