Fix #2090
* client/Windows/wf_graphics.c (wf_register_graphics): Do not register
custom bitmap handler when using freerdp's own GDI implementation.
Fix missing output when using freerdp's rendering
engine
* client/Windows/wf_interface.c (wf_post_connect): Properly initialize
freerdp's GDI subsystem when using freerdp's rendering engine.
Do not invert fb data when rendering with freerdp's engine.
* client/Windows/wf_interface.c (wf_post_connect): Do not pass
`CLRCONV_INVERT' to gdi_init().
Merge pull request #2091 from ptsekov/software-gdi-improvements

Fix #2090