utils/wasm-run.py: clean up naming for WASIRunner (swiftlang#83028)

Author: MaxDesiatov

utils/wasm-run.py

@@ -11,7 +11,7 @@ def collect_wasm_env(local_env=os.environ, prefix='WASM_RUN_CHILD_'):
                 for key, value in local_env.items() if key.startswith(prefix))
 
 
-class WasmtimeRunner(object):
+class WASIRunner(object):
     def __init__(self):
         pass
 
@@ -46,7 +46,7 @@ def main():
                         help='the command to run', metavar='command...')
 
     args = parser.parse_args()
-    runner = WasmtimeRunner()
+    runner = WASIRunner()
     runner.run(args)