fix(Mixed Chart Filter Control): Allow delete condition for adhoc_filters_b

[rtexelm]

SUMMARY

This is meant to fix a bug that would prevent the deletion of filters from Query B in the control panel of a mixed chart.
The condition to run the canDelete function for a filter previously only allowed for adhoc_filters as a valid value but the mixed chart uses adhoc_filters_b for the Query B group. This change should allow any string starting with adhoc_filters to be checked for deletion conditions.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

B:

A:

TESTING INSTRUCTIONS

1. Create a Mixed Chart
2. Add a filter to Query B
3. Delete filter
4. Delete last remaining temporal filter to test warning if is displayed

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[eschutho]

@rtexelm can you add a small test for this, too? Thanks!