dpsim-villas: fix hardcoded paths #2509

Job	Run time
Scan Sourcecode with Cppcheck	3m 30s
Build dpsimpy and tests examples on Fedora Linux	7m 14s
Build Cxx examples on Fedora Linux	10m 48s
Run pytest over all notebooks	13m 31s
Execute WSCC 9 bus example	58s
Run dpsim-mqtt VILLASnode example / Run a VILLASnode example across multiple containers	1m 35s
Run dpsim-mqtt-import-export-MIMO VILLASnode example / Run a VILLASnode example across multiple containers	1m 14s
Run dpsim-mqtt-import-export VILLASnode example / Run a VILLASnode example across multiple containers	1m 24s
Run dpsim-file VILLASnode example / Run a VILLASnode example across multiple containers	1m 27s
Run mqtt-cigre-mv-pf-profiles VILLASnode example / Run a VILLASnode example across multiple containers	1m 54s
Compare Notebook results	8s
	43m 43s

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