Spring Fix DelegatingWebMvcConfigurationTests.configurePathPatternParser()

This PR fixes a variable reference in DelegatingWebMvcConfigurationTests.configurePathPatternParser() as it seems to be a wrong reference.

Comment From: sbrannen

This appears to have been introduced as a copy-n-paste error in https://github.com/spring-projects/spring-framework/commit/e4566c11b8fb3fa5d755339d022dbbc95e910f9c in conjunction with #26414.

Comment From: rstoyanchev

Thanks @izeye!