Disable forceOldRewriteStructSamplers on Mali. The nested_array.*sampler2D_* tests can pass on Mali with disabled forceOldRewriteStructSamplers. Test: dEQP-GLES31.functional.uniform_location.nested_array.*sampler2D_* Bug: angleproject:2703 Change-Id: I34368d6ce14b81e873e2a3d60a73da4a8a866884 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2377627 Commit-Queue: Amy Liu <Amy.Liu@arm.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>