piglit: fix spelling of blacklisted test
piglit.spec.!opengl 1.1.max-texture-size was blacklisted, but the test is:
piglit.spec.!opengl 1_1.max-texture-size
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piglit.spec.!opengl 1.1.max-texture-size was blacklisted, but the test is:
piglit.spec.!opengl 1_1.max-texture-size