strip out unneeded -moz- prefixes

src/skins/vector/css/vector-web/structures/_LeftPanel.scss

@@ -17,7 +17,6 @@ limitations under the License.
 .mx_LeftPanel {
     position: relative;
 
-    display: -moz-box;
     display: -ms-flexbox;
     display: flex;
     flex-direction: column;
@@ -36,7 +35,6 @@ limitations under the License.
 }
 
 .mx_LeftPanel .mx_RoomList_scrollbar {
-    -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
     order: 1;
 
@@ -51,7 +49,6 @@ limitations under the License.
 }
 
 .mx_LeftPanel .mx_BottomLeftMenu {
-    -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
     order: 3;
 

src/skins/vector/css/vector-web/structures/_RightPanel.scss

@@ -17,14 +17,12 @@ limitations under the License.
 .mx_RightPanel {
     position: relative;
 
-    display: -moz-box;
     display: -ms-flexbox;
     display: flex;
     flex-direction: column;
 }
 
 .mx_RightPanel_header {
-    -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
     order: 1;
 
@@ -75,14 +73,12 @@ limitations under the License.
 .mx_RightPanel .mx_MemberList,
 .mx_RightPanel .mx_MemberInfo,
 .mx_RightPanel_blank {
-    -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
     order: 2;
     flex: 1 1 0;
 }
 
 .mx_RightPanel_footer {
-    -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
     order: 3;
 

src/skins/vector/css/vector-web/structures/_RoomDirectory.scss

@@ -22,7 +22,6 @@ limitations under the License.
     margin-bottom: 12px;
     color: $primary-fg-color;
 
-    display: -moz-box;
     display: -ms-flexbox;
     display: flex;
 
@@ -32,7 +31,6 @@ limitations under the License.
 .mx_RoomDirectory_list {
     flex: 1;
 
-    display: -moz-box;
     display: -ms-flexbox;
     display: flex;
 

src/skins/vector/css/vector-web/views/globals/_GuestWarningBar.scss

@@ -18,7 +18,6 @@ limitations under the License.
     background-color: $accent-color;
     color: $accent-fg-color;
 
-    display: -moz-box;
     display: -ms-flexbox;
     display: flex;
     align-items: center;

src/skins/vector/css/vector-web/views/globals/_MatrixToolbar.scss

@@ -18,7 +18,6 @@ limitations under the License.
     background-color: $accent-color;
     color: $accent-fg-color;
 
-    display: -moz-box;
     display: -ms-flexbox;
     display: flex;
     align-items: center;