[Glitch] fix missing style in warning and strike cards

Port 5015e7cee2 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/admin.scss

@@ -1681,6 +1681,15 @@ a.sparkline {
   box-sizing: border-box;
   min-height: 100%;
 
+  a {
+    text: &highlight-text-color;
+    text-decoration: none;
+
+    &:hover {
+      text-decoration: underline;
+    }
+  }
+
   p {
     margin-bottom: 20px;
     unicode-bidi: plaintext;