fix scss: fix mdi mixin
fix scss: fix mdi mixin

jefvel/lumX,lumapps/lumX,hinablue/lumX,lumapps/lumX,jefvel/lumX,hinablue/lumX,lumapps/lumX,hinablue/lumX,jefvel/lumX,hinablue/lumX,jefvel/lumX,lumapps/lumX