Fix bug in BC7 (BPTC) decompression
Fix bug in BC7 (BPTC) decompression

Fix bug in BC7/BPTC decompression that caused incorrect block colors
when using mode 5.

Signed-off-by: Harm Hanemaaijer <2f9537c6ec687a8748c4f2e7dccd545b87138ca3@yahoo.com>

hglm/detex