Fix clang-tidy error

franka_gripper/src/franka_gripper.cpp

@@ -33,8 +33,6 @@ void gripperCommandExecuteCallback(
     double default_speed,
     actionlib::SimpleActionServer<control_msgs::GripperCommandAction>* action_server,
     const control_msgs::GripperCommandGoalConstPtr& goal) {
-  constexpr double kSamePositionThreshold = 1e-4;
-
   auto gripper_command_handler = [goal, grasp_epsilon, default_speed, &gripper]() {
     // HACK: As one gripper finger is <mimic>, MoveIt!'s trajectory execution manager
     // only sends us the width of one finger. Multiply by 2 to get the intended width.
@@ -46,6 +44,7 @@ void gripperCommandExecuteCallback(
                        << state.max_width << " command = " << target_width);
       return false;
     }
+    constexpr double kSamePositionThreshold = 1e-4;
     if (std::abs(target_width - state.width) < kSamePositionThreshold) {
       return true;
     }