Removed repeated lines from Copyright disclaimer/preamble

Author: PrzemekWirkus

workspace_tools/build_api.py

@@ -4,7 +4,6 @@
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
 You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0

workspace_tools/test_api.py

@@ -4,7 +4,6 @@
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
 You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0