Stop checking isFramebufferTexture in copyFramebufferToTexture. #117
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Related issue: http://zentao.internal.oppenlab.com:7000/www/index.php?m=bug&f=view&bugID=672
Description
FramebufferTexturewas first added in mrdoob#22916 becausecopyTexImage2Ddoesn't work withtexStorage2D. However,copyTexImage2Dwas later replaced bycopyTexSubImage2Din mrdoob#22985, making checkingFramebufferTextureunnecessary.However,
FramebufferTextureis still useful in that we don't have to set an image to allocate texture memory.