launch linting (#3729)

Author: SteveMacenski

nav2_bringup/launch/localization_launch.py

@@ -21,8 +21,8 @@
 from launch.actions import SetEnvironmentVariable
 from launch.conditions import IfCondition
 from launch.substitutions import EqualsSubstitution
-from launch.substitutions import NotEqualsSubstitution
 from launch.substitutions import LaunchConfiguration, PythonExpression
+from launch.substitutions import NotEqualsSubstitution
 from launch_ros.actions import LoadComposableNodes, SetParameter
 from launch_ros.actions import Node
 from launch_ros.descriptions import ComposableNode, ParameterFile