Fixed extension "case" errors

[XANOZOID]

Hello! I fixed some files where '.Monkey' was the extension rather than the "Ted2Go" valid '.monkey'.

This fix makes sure the Monkey2 IDE, and probably monkey2 compiler, can view the file correctly.

Notice:

I did not change any of the contents of the files, just the extensions

I created a quick JavaScript tool you can find it, and also use it in the future to lint your extensions, here