cql3/query_processor: Clean up code formatting
cql3/query_processor: Clean up code formatting

Currently, query_processor.cc code formatting is all over the place,
which makes the file hard to read. Apply some formatting magic to make
it prettier.

Message-Id: <5731209a5b6817b76a8cf45098cab36af0eaceb9@scylladb.com>

duarten/scylla,duarten/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,raphaelsc/scylla,raphaelsc/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla