fix global leaks and copy-paste errors

- TCompactProtocol.prototype.writeBool not referencing `booleanField_`
  on `this` correctly. Also using `NULL` instead of `null`.

- TCompactProtocol.prototype.writeVarint64 had a typo for TProtocolException

- TCompactProtocol.prototype.readMapBegin had a typo between `kvtype` and
 `kvType`

- createMultiplexServer leaked a global var `processStatus`

- TFramedTransport had a line that was accidently copy pasted, leading
  to a global leak of `frameLeft`. (I created the patch the introduced
  this copy paste error in Thrift-1353, so I can confirm it was
  a mistake).

- createWebServer tried to check a non-existent var `route` and leaked
  a global `result`

Signed-off-by: Roger Meier <roger@apache.org>