Remove path mapping to self modules

This would cause imports in the common module to reference out/ instead
of src/, this leads to weird behavior when errors are introduced.

src/common/tsconfig.json

@@ -5,10 +5,7 @@
     "types": [
       "../../node_modules/@types/mocha"
     ],
-    "baseUrl": "..",
-    "paths": {
-      "common/*": [ "./common/*" ]
-    }
+    "baseUrl": ".."
   },
   "include": [ "./**/*" ]
 }