built-ins/Boolean/*: make all indentation consistent (depth & character) (#1417)

test/built-ins/Boolean/S15.6.1.1_A1_T1.js

test/built-ins/Boolean/S15.6.1.1_A1_T2.js

test/built-ins/Boolean/S15.6.1.1_A1_T3.js

test/built-ins/Boolean/S15.6.1.1_A1_T4.js

test/built-ins/Boolean/S15.6.1.1_A1_T5.js

test/built-ins/Boolean/S15.6.1.1_A2.js

test/built-ins/Boolean/S15.6.2.1_A1.js

test/built-ins/Boolean/S15.6.3_A1.js

test/built-ins/Boolean/S15.6.3_A3.js

test/built-ins/Boolean/prototype/S15.6.3.1_A4.js

test/built-ins/Boolean/prototype/constructor/S15.6.4.1_A1.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A1_T1.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A1_T2.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A2_T1.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A2_T2.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A2_T3.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A2_T4.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A2_T5.js

test/built-ins/Boolean/prototype/valueOf/S15.6.4.3_A1_T1.js

test/built-ins/Boolean/prototype/valueOf/S15.6.4.3_A1_T2.js