Fix indentation in CoglMatrix
Fix indentation in CoglMatrix

The members of CoglMatrix were indented by 4 characters instead of 2.

Distrotech/cogl,Distrotech/cogl,gcampax/cogl,gcampax/cogl,collects/cogl,djdeath/cogl-android,spatulasnout/cogl,collects/cogl,djdeath/cogl-android,Distrotech/cogl,spatulasnout/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl,djdeath/cogl,djdeath/cogl,gcampax/cogl,djdeath/cogl-android