autotest: use implicit context for AutoTuneSwitch

the wrapper adds nothing

Tools/autotest/arducopter.py

@@ -2329,22 +2329,6 @@ class AutoTestCopter(AutoTest):
         # complete by "customising" the commandline here:
         self.customise_SITL_commandline([])
 
-        self.context_push()
-
-        ex = None
-
-        try:
-            self.fly_autotune_switch_body()
-        except Exception as e:
-            self.print_exception_caught(e)
-            ex = e
-
-        self.context_pop()
-
-        if ex is not None:
-            raise ex
-
-    def fly_autotune_switch_body(self):
         self.set_parameters({
             "RC8_OPTION": 17,
             "ATC_RAT_RLL_FLTT": 20,