🐛 Fix thumbSize assertion with the image provider

Author: AlexV525

example/lib/pages/multi_assets_page.dart

@@ -216,7 +216,11 @@ class _MultiAssetsPageState extends State<MultiAssetsPage>
 
   Widget _imageAssetWidget(AssetEntity asset) {
     return Image(
-      image: AssetEntityImageProvider(asset, isOriginal: false),
+      image: AssetEntityImageProvider(
+        asset,
+        isOriginal: false,
+        thumbSize: <int>[100, 100],
+      ),
       fit: BoxFit.cover,
     );
   }

example/lib/pages/single_assets_page.dart

@@ -186,7 +186,11 @@ class _SingleAssetPageState extends State<SingleAssetPage>
 
   Widget _imageAssetWidget(AssetEntity asset) {
     return Image(
-      image: AssetEntityImageProvider(asset, isOriginal: false),
+      image: AssetEntityImageProvider(
+        asset,
+        isOriginal: false,
+        thumbSize: <int>[100, 100],
+      ),
       fit: BoxFit.cover,
     );
   }