build: Running the license script for files in the types folder (#2066)

Running the license script for files in the types/ folder. This ensures that the license header is included for any files written by owlbot in the types/ folder.

owlbot.py

@@ -229,6 +229,7 @@
 shell.run(('rm', '-rf', 'dev/samples/generated'), hide_output = False)
 
 shell.run(('node', 'scripts/license.js', 'dev/protos'), hide_output = False)
+shell.run(('node', 'scripts/license.js', 'types'), hide_output = False)
 
 node.fix() # fix formatting