fix: Fabric Texture Error

[HassanTeslim007]

Description
There's a red screen error when the Fabric Texture is clicked on

Steps To Reproduce

1. Scroll down to and Click on fabricTexture
2. See error

Expected Behavior
A red Screen shows the error "type 'FabricTextureRenderObject' is not a subtype of type 'RenderObjectWithChildMixin'
in type cast"

Screenshots

Additional Context
Error has been encountered on MacOS and Android. Other platforms have not been tested

[Yczar]

Fixed here: #3