i965: Fix inconsistent indentation in brw_eu_emit.c.

i965: Fix inconsistent indentation in brw_eu_emit.c.

Most of these functions used three spaces for the first level of
indentation, but four spaces for the next level.  One used tabs and then
three spaces.  Some used 3/4 in a then block but 3/3 in the else block.

Normally I try to avoid field days like this, but since the functions
were so inconsistent, even internally, it was making it difficult to
edit without introducing spurious whitespace changes.

So, just get it over with.  git diff -b shows 0 lines changed.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>