remove 'setPixel' from random batch test generator
remove 'setPixel' from random batch test generator

...as it may sometimes fail due to our of bounds coordinates when image
is randomly resized (for example).

oliversalzburg/lwip,mottx/lwip,oliversalzburg/lwip,GrimDerp/lwip,michaelBenin/lwip,antoinepairet/lwip,GrimDerp/lwip,oliversalzburg/lwip,neophob/lwip,michaelBenin/lwip,sanemat/lwip,EyalAr/lwip,gimox/lwip,unbornchikken/lwip,neophob/lwip,EyalAr/lwip,domosapien/lwip,unbornchikken/lwip,MAMISHO/lwip,lpicanco/lwip,unbornchikken/lwip,fireball-x/lwip,domosapien/lwip,cocos-creator/lwip,MAMISHO/lwip,domosapien/lwip,unbornchikken/lwip,fireball-x/lwip,gimox/lwip,weareu/lwip,EyalAr/lwip,gimox/lwip,antoinepairet/lwip,mottx/lwip,michaelBenin/lwip,mottx/lwip,MAMISHO/lwip,fireball-x/lwip,lpicanco/lwip,mottx/lwip,cocos-creator/lwip,sanemat/lwip,neophob/lwip,weareu/lwip,MAMISHO/lwip,weareu/lwip,oliversalzburg/lwip,cocos-creator/lwip,michaelBenin/lwip,sanemat/lwip,neophob/lwip,sanemat/lwip,cocos-creator/lwip,GrimDerp/lwip,lpicanco/lwip,weareu/lwip,domosapien/lwip,fireball-x/lwip,lpicanco/lwip,antoinepairet/lwip,EyalAr/lwip,GrimDerp/lwip,antoinepairet/lwip,gimox/lwip