remove MPI comm from DFTB+ init
Description
Newer versions of DFTB+ stop with an error if an MPI communicator is passed to the constructor of a serial DFTB+. We now removed that communicator as we only use the serial version of DFTB+.
News snippet
Fix MPI communicator error of DFTB+ (versions > 22.1)
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.