CRM: Fix errant object and tag retrieval params

[tbradsha]

Proposed changes

If true, '1', or 1 was passed as a value, it'd cast to string (as '1'), sanitize, and then compare with 'true', evaluating to false.

This switches things to use filter_var( $var, FILTER_VALIDATE_BOOLEAN ) instead.

Related product discussion/links

Does this pull request change what data or activity we track or use?

Testing instructions

• Go to '..'

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Code Coverage Summary

Coverage changed in 2 files.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/crm/api/companies.php	0/40 (0.00%)	0.00%	-3 💚
projects/plugins/crm/api/customers.php	0/47 (0.00%)	0.00%	-3 💚

Full summary · PHP report