Bugfix: Fix PCPCombine extra options removal of semi-colon

[georgemccabe]

Logic was added for #1212 to properly handle lists in METplus config files that were formatted like lists in MET config files, i.e.

["value1", "value2"];

However, the logic incorrectly removes trailing semi-colons when they are not closing a MET format list. This was discovered in PCPCombine wrapper when setting:

FCST_PCP_COMBINE_INPUT_OPTIONS = file_type = NETCDF_NCCF;

When setting extra options for field info, the semi-colon after a single option should be optional and should be added automatically, so the following should also work:

FCST_PCP_COMBINE_INPUT_OPTIONS = file_type = NETCDF_NCCF

Describe the Problem

See above

Expected Behavior

Adding each of the variable examples above to parm/use_cases/met_tool_wrapper/PCPCombine/PCPCombine_add.conf should not cause a failure.

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