Fixed setaccount accepting foreign address

Fixed issue #4209 where using setaccount with a foreign
address causes the address to be added to your receiving addresses.
Changed mixed indentation to four spaces

Put `test/rpc_wallet_tests.cpp` through clang-format.
Merge pull request #4985

bc470c4 Changed mixed indentation to four spaces (Eric Shaw)
31d6390 Fixed setaccount accepting foreign address (Eric Shaw)