Correctly hide table headers in filepicker

Signed-off-by: Raimund Schlüßler <raimund.schluessler@mailbox.org>

core/css/mobile.scss

@@ -121,6 +121,8 @@
 	}
 
 	/* do not show dates in filepicker */
+	#oc-dialog-filepicker-content .filelist #headerSize,
+	#oc-dialog-filepicker-content .filelist #headerDate,
 	#oc-dialog-filepicker-content .filelist .filesize,
 	#oc-dialog-filepicker-content .filelist .date {
 		display: none;