Fix incorrect element selector from #30221 (#30307)

app/javascript/styles/mastodon/components.scss

@@ -4365,10 +4365,6 @@ a.status-card {
     outline: $ui-button-focus-outline;
   }
 
-  .no-reduce-motion .icon {
-    transition: transform 0.15s ease-in-out;
-  }
-
   &.active {
     color: $primary-text-color;
 
@@ -4387,6 +4383,10 @@ a.status-card {
   }
 }
 
+.no-reduce-motion .column-header__button .icon {
+  transition: transform 150ms ease-in-out;
+}
+
 .column-header__collapsible {
   max-height: 70vh;
   overflow: hidden;