Fix hidden search results (#1731)

Author: Saira-A

src/content-handlers/iiif/modules/uv-searchfooterpanel-module/css/styles.less

@@ -117,6 +117,7 @@
           padding: 0;
           max-height: 300px;
           overflow: hidden auto;
+          z-index: 25;
 
           .result {
             padding: 4px;