Set OAE assumptions to default for SSP2-EcBudg400

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Purpose of this PR

Setting OAE assumptions for newly added SSP2-EcBudg400 to default parameters (see Issue 372). This way, the two parameter columns for OAE can be removed from scenario_config.csv

Type of change

• Change of newly added default scenario. Scenario had not been part of earlier validation.

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
• I checked that the in-code documentation is up-to-date
• I adjusted the reporting in remind2 where it was needed
• I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches
• All automated model tests pass (FAIL 0 in the output of make test)
• The changelog CHANGELOG.md has been updated correctly

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File comparison: /p/projects/rd3mod/github/repos/remindmodel/remind/develop/config/scenario_config.csv -> ./config/scenario_config.csv
Columns deleted: cm_33_OAE_eff, cm_33_OAE_scen
Columns added:   -
Renamed columns: -
Renamed rows:    -

Changes in the scenarios:

$allwarnings
NULL