Remove unneeded "MimeType" entry

It does not make sense to provide "MimeType" entry together with the current
"Exec=konsole --background-mode" entry, since that command simple does not
expect file argument.

desktop/quick-access-konsole.desktop

@@ -3,7 +3,6 @@ Type=Application
 Exec=konsole --background-mode
 Icon=utilities-terminal
 X-DocPath=konsole/index.html
-MimeType=application/x-konsole;
 Terminal=false
 X-KDE-StartupNotify=false
 Categories=Qt;KDE;System;TerminalEmulator;