match-default-export-name: refactor to function (#2628)
match-default-export-name: refactor to function (#2628)

[no-log] simple refactoring
andy-ms/tslint,berickson1/tslint,JoshuaKGoldberg/tslint,palantir/tslint,palantir/tslint,IllusionMH/tslint,andy-hanson/tslint,berickson1/tslint,mprobst/tslint,palantir/tslint,mprobst/tslint,andy-hanson/tslint,berickson1/tslint,andy-ms/tslint,IllusionMH/tslint,mprobst/tslint,JoshuaKGoldberg/tslint,IllusionMH/tslint,JoshuaKGoldberg/tslint,andy-hanson/tslint,andy-ms/tslint