Initialise dirty_real_blend_enable in _cogl_pipeline_copy
Initialise dirty_real_blend_enable in _cogl_pipeline_copy

When making a copy of a pipeline, the flag to mark whether the real
blend enable is valid was not being initialised.

Thanks to Damien Lespiau for pointing this out

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit f3adec1faeb651dd97095a02256932cc82761f40)

Distrotech/cogl,Distrotech/cogl,Distrotech/cogl,Distrotech/cogl