clang-format: [JS] no space in union and intersection types.

The operators | and & in types, as opposed to the bitwise operators,
should not have whitespace around them (e.g. `Foo<Bar|Baz>`).

Patch by Martin Probst. Thank you.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263961 91177308-0d34-0410-b5e6-96231b3b80d8