Arrow function tests: remove some stray function calls
Arrow function tests: remove some stray function calls

Follow-up on #3215 which made these redundant, but didn't remove them.

squizlabs/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,stronk7/PHP_CodeSniffer