remove unneeded string

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/res/values/strings.xml

@@ -223,7 +223,6 @@
     <string name="media_state_loading">%1$s (loading)</string>
     <string name="media_event_done">%1$s playback finished</string>
     <string name="media_err_nothing_to_play">No media file found</string>
-    <string name="media_err_no_account">No account provided</string>
     <string name="media_err_not_in_owncloud">The file is not in a valid account</string>
     <string name="media_err_unsupported">Unsupported media codec</string>
     <string name="media_err_io">Could not read the media file</string>