clang-format: Fix formatting of multiple lambdas in initializers.

Before:
  SomeFunction({[&] {
    // comment
  },
                [&] {
                  // comment
                }});

After:
  SomeFunction({[&] {
                  // comment
                },
                [&] {
                  // comment
                }});

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@242138 91177308-0d34-0410-b5e6-96231b3b80d8