fix: do not remove filter region on recycle (#2488)

# Summary

Filter regions were nil as init is not called when view is reused.

apple/Filters/RNSVGFilter.mm

@@ -72,7 +72,7 @@ using namespace facebook::react;
   [super prepareForRecycle];
   _filterUnits = kRNSVGUnitsObjectBoundingBox;
   _primitiveUnits = kRNSVGUnitsUserSpaceOnUse;
-  _filterRegion = nil;
+  _filterRegion = [[RNSVGFilterRegion alloc] init];
 }
 #endif // RCT_NEW_ARCH_ENABLED
 

apple/Filters/RNSVGFilterPrimitive.mm

@@ -16,7 +16,7 @@
 - (void)prepareForRecycle
 {
   [super prepareForRecycle];
-  _filterSubregion = nil;
+  _filterSubregion = [[RNSVGFilterRegion alloc] init];
   _result = nil;
 }
 #endif // RCT_NEW_ARCH_ENABLED