Ensure test file YAML blocks don't have a trailing space. (#2018)

test/language/module-code/instn-star-as-props-dflt-skip.js

...guage/statements/class/definition/methods-gen-no-yield.js

...anguage/statements/class/definition/methods-gen-return.js

...ss/definition/methods-gen-yield-as-expression-with-rhs.js

...definition/methods-gen-yield-as-expression-without-rhs.js

...ds-gen-yield-as-function-expression-binding-identifier.js

...thods-gen-yield-as-generator-method-binding-identifier.js

...ion/methods-gen-yield-as-identifier-in-nested-function.js

.../definition/methods-gen-yield-as-literal-property-name.js

.../definition/methods-gen-yield-as-logical-or-expression.js

...ements/class/definition/methods-gen-yield-as-parameter.js

...ts/class/definition/methods-gen-yield-as-property-name.js

...ements/class/definition/methods-gen-yield-as-statement.js

...ts/class/definition/methods-gen-yield-as-yield-operand.js

.../statements/class/definition/methods-gen-yield-newline.js

.../class/definition/methods-gen-yield-star-after-newline.js

...class/definition/methods-gen-yield-star-before-newline.js

...ements/class/definition/methods-gen-yield-weak-binding.js

test/language/statements/for-of/Array.prototype.entries.js

test/language/statements/for-of/Array.prototype.keys.js