[FIR LT] Unmute some stepping and local variable tests

Corresponding tests were fixed together with #KT-56982, #KT-56913,
#KT-56926

compiler/testData/debug/stepping/lambdaStepInlineWithDefaults.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND_K2_LIGHT_TREE: JVM_IR
-//   Reason: KT-56755
 // FILE: test.kt
 inline fun foo(stringMaker: () -> String = { "OK" }): String {
     return stringMaker()
@@ -19,21 +17,21 @@ fun box(): String {
 }
 
 // EXPECTATIONS JVM JVM_IR
+// test.kt:14 box
+// test.kt:2 box
+// test.kt:3 box
+// test.kt:2 box
+// test.kt:3 box
+// test.kt:15 box
+// test.kt:6 box
+// test.kt:10 box
+// test.kt:7 box
+// test.kt:10 box
 // test.kt:16 box
-// test.kt:4 box
-// test.kt:5 box
-// test.kt:4 box
-// test.kt:5 box
-// test.kt:17 box
-// test.kt:8 box
-// test.kt:12 box
-// test.kt:9 box
-// test.kt:12 box
-// test.kt:18 box
 
 // EXPECTATIONS JS_IR
-// test.kt:4 box
-// test.kt:5 box
-// test.kt:9 box
-// test.kt:12 box
-// test.kt:18 box
+// test.kt:2 box
+// test.kt:3 box
+// test.kt:7 box
+// test.kt:10 box
+// test.kt:16 box