Reenable GL2PS MathText tests.
Reenable GL2PS MathText tests.

Looks like these were accidentally disabled by commit
3d11639a9fbb3559d0506baf8e210210a41b4e90 last March.

Change-Id: Ic7f01e527bb9478dedb96b02772f2f4aad75b826

msmolens/VTK,SimVascular/VTK,candy7393/VTK,keithroe/vtkoptix,demarle/VTK,mspark93/VTK,ashray/VTK-EVM,ashray/VTK-EVM,sankhesh/VTK,keithroe/vtkoptix,demarle/VTK,sumedhasingla/VTK,SimVascular/VTK,demarle/VTK,SimVascular/VTK,sankhesh/VTK,mspark93/VTK,SimVascular/VTK,ashray/VTK-EVM,SimVascular/VTK,keithroe/vtkoptix,gram526/VTK,sumedhasingla/VTK,ashray/VTK-EVM,msmolens/VTK,msmolens/VTK,gram526/VTK,SimVascular/VTK,jmerkow/VTK,mspark93/VTK,sumedhasingla/VTK,msmolens/VTK,demarle/VTK,mspark93/VTK,sumedhasingla/VTK,gram526/VTK,msmolens/VTK,sankhesh/VTK,sankhesh/VTK,jmerkow/VTK,jmerkow/VTK,demarle/VTK,sankhesh/VTK,mspark93/VTK,sankhesh/VTK,keithroe/vtkoptix,candy7393/VTK,jmerkow/VTK,candy7393/VTK,demarle/VTK,gram526/VTK,candy7393/VTK,sumedhasingla/VTK,gram526/VTK,candy7393/VTK,mspark93/VTK,SimVascular/VTK,ashray/VTK-EVM,candy7393/VTK,msmolens/VTK,SimVascular/VTK,jmerkow/VTK,demarle/VTK,gram526/VTK,mspark93/VTK,demarle/VTK,sankhesh/VTK,sumedhasingla/VTK,keithroe/vtkoptix,sumedhasingla/VTK,sankhesh/VTK,jmerkow/VTK,keithroe/vtkoptix,candy7393/VTK,sumedhasingla/VTK,ashray/VTK-EVM,mspark93/VTK,keithroe/vtkoptix,msmolens/VTK,candy7393/VTK,jmerkow/VTK,keithroe/vtkoptix,ashray/VTK-EVM,gram526/VTK,gram526/VTK,jmerkow/VTK,msmolens/VTK,ashray/VTK-EVM