Update ofxAndroidVideoPlayer.cpp

If the texture is unloaded by "unloadTexture()" method and if the Android app goes then to pause state; when returning to resume state a Fatal Error is occuring because the unloaded (unavailable) texture cannot be reloaded.

Due to this bug I added:

    texture.texData.bAllocated = false;

line to the end of unloadTexture() method.