Fix validation of copyImageSubData related to texture completeness Fixed an edge case in validation code where we were not properly ignoring format rules for texture completeness as required for copyImageSubData by the ES 3.2 specification Bug: angleproject:5363 Tests: KHR-GLES32.core.copy_image.r32*_texture Change-Id: Ibf8a6f4708e2135f0eb6f4ba58d4ce413f11ce5b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3379224 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: mohan maiya <m.maiya@samsung.com>