Fixed an issue where the shader would come off when run setTexture.#20603

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HirokiIshimori wants to merge 3 commits intococos2d:v4from

HirokiIshimori:keep-shader-when-call-setTexture

Commits on Oct 22, 2020

Fixed not to setprogramState if programState is already set when calling setTexture.
HirokiIshimori
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Commits on Oct 27, 2020

Fix the condition of setProgramState of setTexture.
HirokiIshimori
committed
Fixed so that the condition of setProgramState of setTexture can be covered in all cases.
HirokiIshimori
committed