Consistently use spaces in features lists (#2000)

test/annexB/built-ins/String/prototype/trimLeft/name.js

test/annexB/built-ins/String/prototype/trimRight/name.js

test/built-ins/ArrayBuffer/Symbol.species/symbol-species.js

test/built-ins/Object/is/symbol-object-is-same-value.js

test/language/statements/for-of/body-dstr-assign-error.js

test/language/statements/for-of/body-dstr-assign.js

test/language/statements/for-of/body-put-error.js