568c99d191
The transform system reacts to `CTX_GPENCIL_STROKES` in a special way
that is only useful in `SPACE_VIEW3D`.
There was a similar case fixed in 23e9ebfdbd, but there would be
multiple other places to also check the spacetype.
So now do this more generalized and only ever set `CTX_GPENCIL_STROKES`
if we are in editmode (that check existed before) **and** in
`SPACE_VIEW3D`.
Pull Request: https://projects.blender.org/blender/blender/pulls/118042