clang-format: [Java] Add space between "synchronized" and "(".

Before:
  synchronized(mData) {
    // ...
  }

After:
  synchronized (mData) {
    // ...
  }

This fixes llvm.org/PR21455.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@221110 91177308-0d34-0410-b5e6-96231b3b80d8