FieldDisplay: Update title variable syntax (#19217)

packages/grafana-ui/src/utils/fieldDisplay.ts

@@ -50,13 +50,13 @@ function getTitleTemplate(title: string | undefined, stats: string[], data?: Dat
 
   const parts: string[] = [];
   if (stats.length > 1) {
-    parts.push('$' + VAR_CALC);
+    parts.push('${' + VAR_CALC + '}');
   }
   if (data.length > 1) {
     parts.push('${' + VAR_SERIES_NAME + '}');
   }
   if (fieldCount > 1 || !parts.length) {
-    parts.push('$' + VAR_FIELD_NAME);
+    parts.push('${' + VAR_FIELD_NAME + '}');
   }
   return parts.join(' ');
 }