Vendor prefix for flexbox not needed anymore

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

apps/files/css/mobile.scss

@@ -60,10 +60,6 @@ table td.filename .nametext .innernametext {
 
 /* proper notification area for multi line messages */
 #notification-container {
-	display: -webkit-box;
-	display: -moz-box;
-	display: -ms-flexbox;
-	display: -webkit-flex;
 	display: flex;
 }
 

core/css/mobile.scss

@@ -5,26 +5,6 @@
 }
 
 #body-login .wrapper {
-	display: -webkit-box;
-	-webkit-box-orient: horizontal;
-	-webkit-box-pack: center;
-	-webkit-box-align: center;
-
-	display: -webkit-flex;
-	-webkit-flex-direction: row;
-	-webkit-align-self: center;
-	-webkit-align-items: center;
-
-	display: -moz-box;
-	-moz-box-orient: horizontal;
-	-moz-box-pack: center;
-	-moz-box-align: center;
-
-	display: -ms-flexbox;
-	-ms-flex-direction: row;
-	-ms-flex-pack: center;
-	-ms-flex-align: center;
-
 	display: flex;
 	flex-direction: row;
 	align-self: center;

core/css/systemtags.scss

@@ -48,7 +48,6 @@
 	}
 	.label {
 		width: 85%;
-		display: -moz-inline-box;
 		display: inline-block;
 		overflow: hidden;
 		text-overflow: ellipsis;