Bugfix for CC2 multipliers summary

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What has been done:

• Patches a problem caused by "wf%n_gs_amplitudes = wf%n_t1", causing a problem when summarizing the multipliers for CC2 @danielhollas #665 (closed)
• Seems like a suboptimal patch but I didn't want to add a new variable (e.g. wf%n_gs_multipliers). Perhaps this is better @SaraiDF

ToDo-list

The boxes below need to be checked before merge review will start

• Testing
  • All tests pass -rcheck flag enabled in setup.py
  • All tests pass -fbatch flag enabled in setup.py
• Versioning
  • Changelog.md is up to date
  • If merge into master: The patch number in parameters.F90 and changelog.md is up to date
• Website (Needs to be done before merge)
  • Updates (if any) to the website have been added
• Compliance with style guide
  • Do's and dont's
  • Documentation style