Instead using of default code style settings, this commit
modifies the ClangFormat plugin to use the code style
settings that were set before applying ClangFormat.
By doing so, we preserve the previously defined code style.
Fixes: QTCREATORBUG-29185
Change-Id: I347d44d5ed49a2c50e130a983b62c844c8964391
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>