fix(phaser.d.ts): Fix optional parameters according to documentation
fix(phaser.d.ts): Fix optional parameters according to documentation

Acaki/WWW_project,photonstorm/phaser-ce,yupaul/phaser-ce,yupaul/phaser-ce,photonstorm/phaser-ce,MasahiroWard/MVPgamedev,natlot/phaser-ce,photonstorm/phaser-ce,adamlabadorf/bobodyssey,photonstorm/phaser-ce,MasahiroWard/MVPgamedev,adamlabadorf/bobodyssey,MasahiroWard/MVPgamedev,natlot/phaser-ce,yupaul/phaser-ce,yupaul/phaser-ce,adamlabadorf/bobodyssey,Acaki/WWW_project,natlot/phaser-ce,MasahiroWard/MVPgamedev,natlot/phaser-ce,Acaki/WWW_project