fixing a typo in the formatting script

Author: antonioc76

scripts/format_package/packageFormat.txt

@@ -15,7 +15,7 @@
 
   <build_depend>rosidl_default_generators</build_depend>
 
-  <exec_depend>rosidl_default_runtim</exec_depend>
+  <exec_depend>rosidl_default_runtime</exec_depend>
   <exec_depend>ros2launch</exec_depend>
 
   <member_of_group>rosidl_interface_packages</member_of_group>