Set Test-runner to false for alphametics (exercism#2496)

* Set Test-runner to false for alphametics

* Added test_runner Practice Exercise Config Key

* Moved test_runner key out of files

* Removed trailing comma in files key

* Update exercises/practice/alphametics/.meta/config.json

updated!

Author: BethanyG

bin/data.py

@@ -134,6 +134,7 @@ class ExerciseConfig:
     forked_from: str = None
     contributors: List[str] = None
     language_versions: List[str] = None
+    test_runner: bool = True
     source: str = None
     source_url: str = None
     blurb: str = None

exercises/practice/alphametics/.meta/config.json

@@ -26,5 +26,6 @@
     "example": [
       ".meta/example.py"
     ]
-  }
+  },
+  "test_runner": false
 }