mesa/main: Fix multisample texture initialize

Sampler of Multisample textures wasn't initialized correct. So when
texture object created as  multisample its sampler is initialized in a
individual case. We change the initial state of TEXTURE_MIN_FILTER and
TEXTURE_MAG_FILTER to NEAREST.
These changes are approved by KhronosGroup.
https://github.com/KhronosGroup/OpenGL-API/issues/45

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109057
Signed-off-by: Sergii Romantsov <sergii.romantsov@globallogic.com>
Signed-off-by: Illia Iorin <illia.iorin@globallogic.com>
25 jobs for !177 with fix/dsa_tex_init in 51 minutes and 28 seconds (queued for 40 minutes and 53 seconds)
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