dimr_config for parallel run with RRcomponent is incorrect

[MRVermeulenDeltares]

Describe the bug
In #562 and update was done to improve the writing of the process for the parallel run for the FMcomponent to the dimr_config.
During development of this issue it was discovered that the RRcomponent can also be given a process, as it inherits from abstract component in which process is configured.
When setting the process for the RRcomponent the dimr_config will have the process in the file.

The RRcomponent however cannot run in parallel, thus this setting is incorrect.
How this should behave is to be further decided, @rhutten.

To Reproduce
The file resulting from the code below contains an invalid entry:

from hydrolib.core.dimr.models import DIMR, FMComponent
fm_comp = RRComponent(name="test", workingDir='.', inputfile='test.mdu',
                      process=4, mpiCommunicator="DFM_COMM_DFMWORLD")
dimr = DIMR(component=fm_comp)
dimr.save(filepath='dimr_config.xml')

Expected behavior
The process should not be written for the RRcomponent to the dimr_config, to be further decided by @rhutten.

Version info (please complete the following information):

• OS: windows 10
• Version 0.7.0

Additional context
Based on what is decided, the solution of #562 might help with the implementation of this issue.