fix python dict conversion of design output in `thermoanalysis.pyx`

[pessoa-am]

This fixes erroneous primer design output in the following situations:

• one primer type:

  • f'PRIMER_RIGHT{int_oligo}_{i}_PROBLEMS' must be f'PRIMER_{int_oligo}_{i}_PROBLEMS'
  • f'PRIMER_LEFT_{i}_POSITION_PENALTY' and f'PRIMER_RIGHT_{i}_POSITION_PENALTY' should only be added to output_dict when designing left primers and right primers, respectively

• when using mispriming library:

  • 'PRIMER_LEFT_{i}_LIBRARY_MISPRIMING' , 'PRIMER_RIGHT_{i}_LIBRARY_MISPRIMING' and 'PRIMER_PAIR_{i}_LIBRARY_MISPRIMING' must be f-strings