Fix skipping of default values for extra props
Fix skipping of default values for extra props

Values from "extra props", i.e. those where dontSetInEditor is
set to YES, were always written to the file, even if the value
was equal to the default serialization.

olegnaumenko/SpriteBuilder,spritebuilder/SpriteBuilder,FrancoisDupayrat/CocosBuilder,oxeron/SpriteBuilder,eric-seekas/SpriteBuilder,mafiagame/CocosBuilder,meiry/CocosBuilder,yaoxiaoyong/CocosBuilder,eric-seekas/SpriteBuilder,FrancoisDupayrat/CocosBuilder,apportable/SpriteBuilder,diwip/SpriteBuilder,shkatulo/CocosBuilder-cc2dx-3-compatible,olegnaumenko/SpriteBuilder,nicollhunt/CocosBuilder,cocos2d/CocosBuilder,RobertPeng/CocosBuilder,chipsCode/cocosbuilder3,Infosfer/CocosBuilder,chipsCode/CocosBuilder,yaoxiaoyong/CocosBuilder,diwip/SpriteBuilder,oxeron/CocosBuilder,spritebuilder/SpriteBuilder,oxeron/CocosBuilder,quicklyslow/SpriteBuilder,meiry/CocosBuilder,nicollhunt/CocosBuilder,harimfl/CocosBuilder,Infosfer/CocosBuilder,chipsCode/CocosBuilder,cocos2d/CocosBuilder,iTyran/CocosBuilder,oxeron/SpriteBuilder,eric-seekas/SpriteBuilder,RobertPeng/CocosBuilder,iTyran/CocosBuilder,mafiagame/CocosBuilder,diwip/SpriteBuilder,nicollhunt/CocosBuilder,shkatulo/CocosBuilder-cc2dx-3-compatible,ZeusbaseGameWorkshop/SpriteBuilder,oxeron/SpriteBuilder,Jennal/CocosBuilder,rraallvv/SpriteBuilder,apportable/SpriteBuilder,rraallvv/SpriteBuilder,shkatulo/CocosBuilder-cc2dx-3-compatible,RobertPeng/CocosBuilder,diwip/SpriteBuilder,rraallvv/SpriteBuilder,Jennal/CocosBuilder,apportable/SpriteBuilder,spritebuilder/SpriteBuilder,eric-seekas/SpriteBuilder,oxeron/CocosBuilder,RobertPeng/SpriteBuilder,yaoxiaoyong/CocosBuilder,chipsCode/cocosbuilder3,eric-seekas/SpriteBuilder,oxeron/SpriteBuilder,DNESS/SpriteBuilder,eric-seekas/SpriteBuilder,mafiagame/CocosBuilder,chipsCode/cocosbuilder3,apportable/SpriteBuilder,meiry/CocosBuilder,FrancoisDupayrat/CocosBuilder,quicklyslow/SpriteBuilder,FrancoisDupayrat/CocosBuilder,meiry/CocosBuilder,diogocarneiro/SpriteBuilder,apportable/SpriteBuilder,nicollhunt/CocosBuilder,mafiagame/CocosBuilder,harimfl/CocosBuilder,chipsCode/CocosBuilder,ZeusbaseGameWorkshop/SpriteBuilder,ppiecuch/CocosBuilder,DNESS/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,quicklyslow/SpriteBuilder,Jennal/CocosBuilder,chipsCode/cocosbuilder3,diwip/SpriteBuilder,iTyran/CocosBuilder,Infosfer/CocosBuilder,chipsCode/CocosBuilder,olegnaumenko/SpriteBuilder,DNESS/SpriteBuilder,spritebuilder/SpriteBuilder,RobertPeng/SpriteBuilder,oxeron/SpriteBuilder,RobertPeng/CocosBuilder,iTyran/CocosBuilder,harimfl/CocosBuilder,Infosfer/CocosBuilder,DNESS/SpriteBuilder,rraallvv/SpriteBuilder,quicklyslow/SpriteBuilder,meiry/CocosBuilder,harimfl/CocosBuilder,rraallvv/SpriteBuilder,Infosfer/CocosBuilder,cocos2d/CocosBuilder,diogocarneiro/SpriteBuilder,olegnaumenko/SpriteBuilder,Jennal/CocosBuilder,shkatulo/CocosBuilder-cc2dx-3-compatible,RobertPeng/SpriteBuilder,mafiagame/CocosBuilder,ZeusbaseGameWorkshop/SpriteBuilder,diogocarneiro/SpriteBuilder,RobertPeng/CocosBuilder,ppiecuch/CocosBuilder,RobertPeng/SpriteBuilder,RobertPeng/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,ppiecuch/CocosBuilder,spritebuilder/SpriteBuilder,yaoxiaoyong/CocosBuilder,chipsCode/CocosBuilder,DNESS/SpriteBuilder,diogocarneiro/SpriteBuilder,quicklyslow/SpriteBuilder,olegnaumenko/SpriteBuilder,shkatulo/CocosBuilder-cc2dx-3-compatible,spritebuilder/SpriteBuilder,oxeron/CocosBuilder,ZeusbaseGameWorkshop/SpriteBuilder,oxeron/SpriteBuilder,harimfl/CocosBuilder,chipsCode/cocosbuilder3,cocos2d/CocosBuilder,DNESS/SpriteBuilder,diwip/SpriteBuilder,oxeron/CocosBuilder,Jennal/CocosBuilder,diogocarneiro/SpriteBuilder,RobertPeng/SpriteBuilder,yaoxiaoyong/CocosBuilder,oxeron/CocosBuilder,diogocarneiro/SpriteBuilder,nicollhunt/CocosBuilder,apportable/SpriteBuilder,ppiecuch/CocosBuilder,olegnaumenko/SpriteBuilder