Remove language definition from package.json

The PowerShell language definition got added back to package.json due to a
recent rebase.  This change removes it again.

Author: daviwil

package.json

@@ -48,16 +48,6 @@
 			"title": "Get online help for command",
 			"category": "PowerShell"
 		}],
-		"languages": [{
-			"id": "PowerShell",
-			"extensions": [ ".ps1", ".psm1", ".psd1", ".pssc", ".psrc" ],
-			"aliases": [ "PowerShell", "powershell", "ps", "ps1" ]
-		}],
-		"grammars": [{
-			"language": "PowerShell",
-			"scopeName": "source.powershell",
-			"path": "./syntaxes/PowerShell.tmLanguage"
-		}],
 		"snippets": [
 			{
 				"language": "powershell",