Use IntGauge for media counts

src/main.rs

@@ -381,8 +381,8 @@ fn update_media_counts(media_dir: &PathBuf) {
         }
     }
 
-    IMAGE_GAUGE.set(image_count);
+    IMAGE_GAUGE.set(image_count as f64);
-    VIDEO_GAUGE.set(video_count);
+    VIDEO_GAUGE.set(video_count as f64);
 }
 
 fn is_image(entry: &DirEntry) -> bool {