[test][execution] Modify user/user/loop/1 to ensure bug in beat/beat.backend.python is fixed

Like this the test passes but is known to trigger
the issue described in beat.backend.python#26
and fixed by beat.backend.python!59.

beat/core/test/prefix/experiments/user/user/loop/1/loop.json

@@ -17,7 +17,7 @@
 
             "evaluator_algorithm": "user/db_input_loop_evaluator/1",
             "evaluator_parameters": {
-                "threshold": 1
+                "threshold": 9
             },
             "evaluator_inputs": {
                 "in_loop": "in_loop"

beat/core/test/test_execution.py

@@ -349,7 +349,7 @@ class BaseExecutionMixIn(object):
     def test_loop_1(self):
         nose.tools.assert_is_none(
             self.execute(
-                "user/user/loop/1/loop", [{"sum": 504, "nb": 9}, {"sum": 72, "nb": 9}]
+                "user/user/loop/1/loop", [{"sum": 135, "nb": 9}, {"sum": 9, "nb": 9}]
             )
         )