[K/Wasm] Unmute most of the stepping tests for Wasm in K1

compiler/testData/debug/stepping/multilineInfixCall.kt

@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: WASM
+
 // FILE: test.kt
 
 fun box() {
@@ -20,3 +20,10 @@ infix fun Int.foo(i: Int) {
 // test.kt:5 box
 // test.kt:10 foo
 // test.kt:7 box
+
+// EXPECTATIONS WASM
+// test.kt:1 $box
+// test.kt:5 $box (4, 4)
+// test.kt:6 $box
+// test.kt:10 $foo
+// test.kt:7 $box