Simple change - default proxy file picker to list both .VRMesh AND .VRScene

[jskt]

Since .VRMesh files don't carry material information they're fairly useless for our entouraging workflow, so we use .VRScene files instead. Every time we go to pick one in the Objects tab of the Appearance Manager, we have to change the dropdown from listing only .VRMesh to listing only .VRScene.

The default should be to list both types of files in the picker.

[Ana Lyubenova]

Jon, again, make sure you're using the hotfix.

[jskt]

Thank you!