Revert "Update protobuf file headers" (#50)

The update was not necessary, as we want to keep the old format.

This reverts commit d104333.

Author: llucax

proto/frequenz/api/common/components.proto

@@ -1,9 +1,10 @@
 // Frequenz microgrid components definitions.
 //
+// Copyright:
 // Copyright 2023 Frequenz Energy-as-a-Service GmbH
 //
-// Licensed under the MIT License (the "License");
-// you may not use this file except in compliance with the License.
+// License:
+// MIT
 
 syntax = "proto3";
 

proto/frequenz/api/common/metrics.proto

@@ -1,9 +1,10 @@
 // Metrics & bounds definitions.
 //
+// Copyright:
 // Copyright 2023 Frequenz Energy-as-a-Service GmbH
 //
-// Licensed under the MIT License (the "License");
-// you may not use this file except in compliance with the License.
+// License:
+// MIT
 
 syntax = "proto3";
 

proto/frequenz/api/common/metrics/electrical.proto

@@ -1,9 +1,10 @@
 // Contains definitions for electrical metrics (AC and DC).
 //
+// Copyright:
 // Copyright 2023 Frequenz Energy-as-a-Service GmbH
 //
-// Licensed under the MIT License (the "License");
-// you may not use this file except in compliance with the License.
+// License:
+// MIT
 
 syntax = "proto3";