fix: provide theme to SvgAssetLoader instead of SvgPicture (#532)

## What does this change?

Since version 5.5.0+1, the `SvgTheme` no longer works. It doesn't work because flutter_svg has deprecated using the `theme` with the `SvgPicture` constructor, and suggests that you pass the theme to the bytes loader instead.

Fixes #531  🎯

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

Author: Kirpal

examples/example/lib/gen/assets.gen.dart

@@ -318,7 +318,7 @@ class SvgGenImage {
           ? AssetBytesLoader(_assetName,
               assetBundle: bundle, packageName: package)
           : SvgAssetLoader(_assetName,
-              assetBundle: bundle, packageName: package),
+              assetBundle: bundle, packageName: package, theme: theme),
       key: key,
       matchTextDirection: matchTextDirection,
       width: width,
@@ -329,7 +329,6 @@ class SvgGenImage {
       placeholderBuilder: placeholderBuilder,
       semanticsLabel: semanticsLabel,
       excludeFromSemantics: excludeFromSemantics,
-      theme: theme,
       colorFilter: colorFilter ??
           (color == null ? null : ColorFilter.mode(color, colorBlendMode)),
       clipBehavior: clipBehavior,

examples/example_resources/lib/gen/assets.gen.dart

@@ -186,7 +186,7 @@ class SvgGenImage {
           ? AssetBytesLoader(_assetName,
               assetBundle: bundle, packageName: package)
           : SvgAssetLoader(_assetName,
-              assetBundle: bundle, packageName: package),
+              assetBundle: bundle, packageName: package, theme: theme),
       key: key,
       matchTextDirection: matchTextDirection,
       width: width,
@@ -197,7 +197,6 @@ class SvgGenImage {
       placeholderBuilder: placeholderBuilder,
       semanticsLabel: semanticsLabel,
       excludeFromSemantics: excludeFromSemantics,
-      theme: theme,
       colorFilter: colorFilter ??
           (color == null ? null : ColorFilter.mode(color, colorBlendMode)),
       clipBehavior: clipBehavior,

packages/core/lib/generators/integrations/svg_integration.dart

@@ -62,7 +62,7 @@ ${isPackage ? "\n  static const String package = '$packageName';" : ''}
     return SvgPicture(
       _isVecFormat ? 
         AssetBytesLoader(_assetName, assetBundle: bundle, packageName: package) :
-        SvgAssetLoader(_assetName, assetBundle: bundle, packageName: package),
+        SvgAssetLoader(_assetName, assetBundle: bundle, packageName: package, theme: theme),
       key: key,
       matchTextDirection: matchTextDirection,
       width: width,
@@ -73,7 +73,6 @@ ${isPackage ? "\n  static const String package = '$packageName';" : ''}
       placeholderBuilder: placeholderBuilder,
       semanticsLabel: semanticsLabel,
       excludeFromSemantics: excludeFromSemantics,
-      theme: theme,
       colorFilter: colorFilter ?? (color == null ? null : ColorFilter.mode(color, colorBlendMode)),
       clipBehavior: clipBehavior,
       cacheColorFilter: cacheColorFilter,