Prevent event tiles being shrunk/collapsed by flexbox (#7942)

Author: t3chguy

res/css/views/rooms/_EventBubbleTile.scss

@@ -36,7 +36,6 @@ limitations under the License.
     margin-top: var(--gutterSize);
     margin-left: 49px;
     font-size: $font-14px;
-    flex-shrink: 0;
 
     .mx_ThreadInfo {
         clear: both;

res/css/views/rooms/_EventTile.scss

@@ -18,6 +18,8 @@ limitations under the License.
 $left-gutter: 64px;
 
 .mx_EventTile {
+    flex-shrink: 0;
+
     .mx_EventTile_receiptSent,
     .mx_EventTile_receiptSending {
         // Give it some dimensions so the tooltip can position properly