ImageWithRgba displayed image does not change when the supplied image.Image parameter changes

[araoko]

unlike the ImageWithFile method, when ImageWithRgba is called with a different image.Image parameter does not change the image displayed
if the parameter changes when in the event loop, the image is not replaced. if the size is changed, the old image will just be resized but it will not be replaced by the new image.
ImageWithFile on the other hand appears to be re-evaluated every time in the event loop as the image changes

[gucio321]

@araoko does this fix the issue? #713

[araoko]

@araoko does this fix the issue? #713

I dont have the updates. I did a go get -u ./... and still have the old code

[gucio321]

Go get -u giupath@latestcommithash