evas: Fix bad clipping with proxy

evas: Fix bad clipping with proxy

evas-images2 example was broken due to excessive clipping.
This is one more issue with the cached clip geometry.

By default proxy_src_clip is true. The doc (that I wrote)
mentions that it means both objects (image proxy & source)
share the same clipper. So, this does not mean that the proxy
is clipped to the geometry of the source (this can be useful
in some cases, when replacing an object with a proxy to apply
some kind of effect on it... but this could be rare).

Thanks Amitesh for the report.

@fix