Added the Amxx Pawn syntax repository/a.json (#6330)

* Added the Amxx Pawn syntax and builder to repository/a.json

* Removed the `build system` keyword from Amxx Pawn package due

the new update removing it.

* Replaced redundant label `amxx pawn` on repository/a.json by

amxmodx

repository/a.json

@@ -664,6 +664,17 @@
 				}
 			]
 		},
+		{
+			"name": "Amxx Pawn",
+			"details": "https://github.com/evandrocoan/SublimeAmxxPawn",
+			"labels": ["language syntax", "amxmodx", "amx mod x"],
+			"releases": [
+				{
+					"sublime_text": ">=3114",
+					"tags": true
+				}
+			]
+		},
 		{
 			"name": "Anaconda",
 			"details": "https://github.com/DamnWidget/anaconda",