[vscode] add ".jasm" extension is vscode package.json

[shazz]

Currently, only ".asm" files are recognized to be c64jasm source files, which conflicts with a lot of other c64 and mostly any assembly vscode extensions.

Could you just add also ".jasm" as a possible extension?

"languages": [
			{
				"id": "asm",
				"extensions": [
					".asm", ".jasm"
				],
...

thanks in advance !