[IR] update testdata: print whole string concatenation at one line

compiler/testData/ir/irText/regressions/coercionInLoop.kt.txt

@@ -4,8 +4,7 @@ fun box(): String {
   var i: Int = 0
   while (x.hasNext()) { // BLOCK
     when {
-      ieee754equals(arg0 = a.get(index = i), arg1 = x.next()).not() -> return "Fail " + 
-i
+      ieee754equals(arg0 = a.get(index = i), arg1 = x.next()).not() -> return "Fail " + i
     }
     { // BLOCK
       val tmp0: Int = i