JS Backend: #KT-5320 Fixed (generated code for ternary operator)
Merge pull request #500 from MichaelNedzelsky/kt5320

JS Backend: fixed associativity of JsCondition(ternary operator).

Fixed wrong code generation when use JsCondition(ternary operator) as condition of simple `if`(JsCondition).

#KT-5320 fixed