built-ins/Number/*: make all indentation consistent (depth & character) (#1436)

test/built-ins/Number/15.7.3-2.js

test/built-ins/Number/15.7.4-1.js

test/built-ins/Number/MAX_VALUE/S15.7.3.2_A4.js

test/built-ins/Number/MIN_VALUE/S15.7.3.3_A4.js

test/built-ins/Number/NEGATIVE_INFINITY/S15.7.3.5_A2.js

test/built-ins/Number/POSITIVE_INFINITY/S15.7.3.6_A2.js

test/built-ins/Number/S15.7.1.1_A1.js

test/built-ins/Number/S15.7.1.1_A2.js

test/built-ins/Number/S15.7.2.1_A1.js

test/built-ins/Number/S15.7.2.1_A3.js

test/built-ins/Number/S15.7.3_A1.js

test/built-ins/Number/S15.7.3_A2.js

test/built-ins/Number/S15.7.3_A3.js

test/built-ins/Number/S15.7.3_A4.js

test/built-ins/Number/S15.7.3_A5.js

test/built-ins/Number/S15.7.3_A6.js

test/built-ins/Number/S15.7.3_A8.js

test/built-ins/Number/S15.7.5_A1_T01.js

test/built-ins/Number/S15.7.5_A1_T02.js

test/built-ins/Number/S15.7.5_A1_T03.js