make a-mixin indents consistent (#1607)
make a-mixin indents consistent (#1607)


fernandojsg/aframe,fernandojsg/aframe,chenzlabs/aframe,ngokevin/aframe,weddingdj/aframe,dmarcos/aframe,aframevr/aframe,jaxmolina/ar,darkwing/aframe,RSpace/aframe,weddingdj/aframe,ngokevin/aframe,chenzlabs/aframe,aframevr/aframe,jaxmolina/ar,wizgrav/aframe,RSpace/aframe,googlecreativelab/aframe,dmarcos/aframe,mkungla/aframe,mkungla/aframe,googlecreativelab/aframe,wizgrav/aframe,darkwing/aframe