Exported image's background color is always transparent
### Discussed in https://github.com/vinothpandian/react-sketch-canvas/discussions/98

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<sup>Originally posted by **quan787** December  3, 2022</sup>
Even if I have `canvasColor="#FFFFFFFF"` in props, the exported image still has a transparent background. Like this one:

![mask (6)](https://user-images.githubusercontent.com/16741020/205461380-27c3f327-daad-448b-942a-2ee7bd61cfff.png)

edit:

I think there is some conflicts between `canvasColor` and `backgroundImage`. When update  `backgroundImage`, the background color become transparent. After that, any change to  `canvasColor` won't take effect.
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