Remove duplicate frontmatter tags

test/built-ins/Date/S15.9.3.1_A5_T1.js

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-esid: sec-date-constructor
 info: >
     The [[Value]] property of the newly constructed object
     is set by following steps:

test/built-ins/Date/S15.9.3.1_A5_T2.js

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-esid: sec-date-constructor
 info: >
     The [[Value]] property of the newly constructed object
     is set by following steps:

test/built-ins/Date/S15.9.3.1_A5_T3.js

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-esid: sec-date-constructor
 info: >
     The [[Value]] property of the newly constructed object
     is set by following steps:

test/built-ins/Date/S15.9.3.1_A5_T4.js

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-esid: sec-date-constructor
 info: >
     The [[Value]] property of the newly constructed object
     is set by following steps:

test/built-ins/Date/S15.9.3.1_A5_T5.js

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-esid: sec-date-constructor
 info: >
     The [[Value]] property of the newly constructed object
     is set by following steps:

test/built-ins/Date/S15.9.3.1_A5_T6.js

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-esid: sec-date-constructor
 info: >
     The [[Value]] property of the newly constructed object
     is set by following steps: