Fix lint errors in restrictPlusOperandsRule.ts
Fix lint errors in restrictPlusOperandsRule.ts

palantir/tslint,mprobst/tslint,JoshuaKGoldberg/tslint,JoshuaKGoldberg/tslint,palantir/tslint,JoshuaKGoldberg/tslint,mprobst/tslint,mprobst/tslint,palantir/tslint