Blender Git Loki

Fix T47433: Driven shapekey values (from 2.4x) are not indicated as having drivers

Only Driver FCurves with named shapekeys (instead of shapekey indices) was
getting picked up by the UI code for testing whether a property had drivers
or not. So, while this version patching code worked when it was initially
written for the 2.4x -> 2.5 transition, some subsequent changes ended up
breaking this. As this stuff is not used often, the breakage wasn't noticed.