Remove duplicative tests

The behavior asserted by the removed tests is covered by other files.

- test/language/line-terminators/7.3-1.js duplicates
  test/language/line-terminators/S7.3_A1.3.js
- test/language/line-terminators/7.3-2.js duplicates
  test/language/line-terminators/S7.3_A1.4.js
- test/language/line-terminators/7.3-3.js duplicates
  test/language/line-terminators/S7.3_A3.3_T1.js
- test/language/line-terminators/7.3-4.js duplicates
  test/language/line-terminators/S7.3_A3.4_T1.js
- test/language/line-terminators/7.3-9.js duplicates
  test/language/line-terminators/S7.3_A6_T3.js
- test/language/line-terminators/7.3-10.js  duplicates
  test/language/line-terminators/S7.3_A6_T4.js
- test/language/line-terminators/S7.3_A1.1_T1.js duplicates
  test/language/line-terminators/S7.3_A1.1_T2.js
- test/language/line-terminators/S7.3_A1.2_T1.js duplicates
  test/language/line-terminators/S7.3_A1.2_T2.js
- test/language/line-terminators/S7.3_A3.1_T2.js duplicates
  test/language/line-terminators/S7.3_A3.1_T3.js
- test/language/line-terminators/S7.3_A3.2_T3.js duplicates
  test/language/line-terminators/S7.3_A3.2_T1.js
- test/language/line-terminators/S7.3_A3.3_T2.js duplicates
  test/language/line-terminators/S7.3_A3.3_T1.js
- test/language/line-terminators/S7.3_A3.4_T2.js duplicates
  test/language/line-terminators/S7.3_A3.4_T1.js
- test/language/line-terminators/S7.3_A4_T1.js duplicates
  test/language/line-terminators/S7.3_A3.1_T1.js
- test/language/line-terminators/S7.3_A5.1_T1.js duplicates
  test/language/line-terminators/S7.3_A5.1_T2.js
- test/language/line-terminators/S7.3_A5.2_T1.js duplicates
  test/language/line-terminators/S7.3_A5.2_T2.js