trivial: Fix clang-format of JSON files for newer versions of clang

This explains why Mario and I had different precommit settings.

.clang-format

@@ -36,6 +36,9 @@ PenaltyBreakBeforeFirstCallParameter: '15'
 ---
 Language: 'Proto'
 ---
+Language: 'Json'
+BasedOnStyle: llvm
+---
 Language: 'Cpp'
 IncludeCategories:
   - Regex:           '^"config.h"$'