mesa/main: Fix multisample texture initialize

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

Signed-off-by: Sergii Romantsov <sergii.romantsov@globallogic.com>
Signed-off-by: Illia Iorin <illia.iorin@globallogic.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109057