Update standardize_grants_dict to handle potential case mismatches in grants table response

[lamalex]

Match case to column names returned rather than hardcoding.
Fixes: #1086

resolves #1086
docs dbt-labs/docs.getdbt.com/#

Problem

DBT crashing due to column case mismatch in response from databricks on show grants statement.

Solution

Match column name case to response rather than hardcoding names.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

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[lamalex]

signed again!