i965: Fix gl_TessLevelOuter[] for isolines.

Thanks to James Legg for finding this!

From the ARB_tessellation_shader spec:
"The number of isolines generated is derived from the first outer
 tessellation level; the number of segments in each isoline is
 derived from the second outer tessellation level."

According to the PRM, "TF.LineDensity determines # lines" while
"TF.LineDetail determines # segments".  Line Density is stored at
DWord 6, while Line Detail is at DWord 7.  So, they're not reversed
like they are for triangles and quads.

Fixes Piglit's spec/arb_tessellation_shader/execution/isoline,
and about 24 dEQP isoline tests (with GL_EXT_tessellation_shader
hacked on - it's not normally enabled).

Cc: [email protected]
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94524
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>

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