runUnitTest: fix new --instance_home option

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41809 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/runUnitTest.py

@@ -700,7 +700,7 @@ def main():
       os.environ["PRODUCTS_PATH"] = arg
     elif opt == "--sys_path":
       sys.path.extend(arg.split(','))
-    elif opt == "instance_home=":
+    elif opt == "--instance_home":
       instance_home = os.path.abspath(arg)
 
   global tests_home