Fix layout of sessions tab buttons (#11279)

Author: t3chguy

res/css/components/views/settings/devices/_FilteredDeviceListHeader.pcss

@@ -29,6 +29,11 @@ limitations under the License.
     background-color: $panels;
     border-radius: 8px;
     color: $secondary-content;
+
+    /* Higher specificity selector to override the flex-start value */
+    .mx_AccessibleButton.mx_AccessibleButton_hasKind {
+        align-self: center;
+    }
 }
 
 .mx_FilteredDeviceListHeader_label {