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

...row-function/syntax/arrowparameters-cover-initialize-2.js

...xpressions/object/method-definition/generator-no-yield.js

.../expressions/object/method-definition/generator-return.js

.../object/method-definition/yield-as-expression-with-rhs.js

...ject/method-definition/yield-as-expression-without-rhs.js

...nition/yield-as-function-expression-binding-identifier.js

...efinition/yield-as-generator-method-binding-identifier.js

...thod-definition/yield-as-identifier-in-nested-function.js

...bject/method-definition/yield-as-literal-property-name.js

...bject/method-definition/yield-as-logical-or-expression.js

...xpressions/object/method-definition/yield-as-parameter.js

...ssions/object/method-definition/yield-as-property-name.js

...xpressions/object/method-definition/yield-as-statement.js

...ssions/object/method-definition/yield-as-yield-operand.js

...age/expressions/object/method-definition/yield-newline.js

...ions/object/method-definition/yield-star-after-newline.js

...ons/object/method-definition/yield-star-before-newline.js

...xpressions/object/method-definition/yield-weak-binding.js

test/language/expressions/object/property-name-yield.js

test/language/identifiers/val-yield-strict.js