Fix missing argument to SampleEditorControl

[vanjac]

This allows it to compile with the __LOWRES__ flag set, which was broken by 075d32ec2662cbbf52caf45e1ec97a2df3254248

[coderofsalvation]

@vanjac awesome how can we test this? what was the perceived side-effect?

[vanjac]

The problem arises when compiling with the __LOWRES__ macro defined, it can be tested by adding add_definitions(-D__LOWRES__) to CMakeLists. Previously this wouldn't compile since an argument was added to SampleEditorControl without updating all references.