InputConfigDiag: Put the colon after the device name

Oops. The dialog accidentally generated the wrong syntax for
this one.
VertexShaderGen: Fix a potential bug where vertex shader uids don't change when pixel lighting is toggled.
PixelShaderGen: Store early_ztest as part of shader uid.
PixelShaderGen: Fix a small early-ztest related bug.
InputConfigDialog: Don't show "..." for complicated expressions

Just show the actual expression. We need to do a bit of mangling
here as wx has no way to turn off mnemonics parsing, so do that
as well.