[RogueC] Fixed bug coercing arg to single Value parameter 
[RogueC] Fixed bug coercing arg to single Value parameter 

- For single args and single-parameter methods:
- Coercing arg to String using to->String worked fine
- arg to Value using to->Value had a copy & paste error.
- Code was checking for param type String before calling arg->Value.
- Should instead check for param type Value before calling arg->Value.
- Also removed old, commented-out block of code.
Plasmaworks/Rogue,AbePralle/Rogue,Plasmaworks/Rogue,Plasmaworks/Rogue,AbePralle/Rogue,Plasmaworks/Rogue