fix Tech|*|Capital Costs|w/ Adj Costs on reference run

[orichters]

Purpose of this PR

• fixes https://github.com/remindmodel/development_issues/issues/228
• follow-up of fix Tech|*|Capital Costs|w/ Adj Costs to reference run #1429
• if, in some iteration, a value is assigned to o_avgAdjCostInv, but then vm_deltaCap drops to zero, the value is not reset to 0.
• So now, if v_costInvTeAdj = 0 or vm_deltaCap = 0, set o_avgAdjCostInv to 0.

Type of change

• Bug fix

Checklist:

• My code follows the coding etiquette
• I performed a self-review of my own code
• I explained my changes within the PR, particularly in hard-to-understand areas
• All automated model tests pass (FAIL 0 in the output of make test)
• The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Test runs are here: /p/tmp/oliverr/remind/output/SSP2EU-NDC_2023-11-24_14.34.17

[cchrisgong]

Okay, nice catch!