[Native] Drop LLDB_TRACE test directive

This directive doesn't have a lot of meaning. It is always set this
way that we are getting text file with the same name as test file.

native/native.tests/testData/lldb/kt33055.kt

@@ -1,6 +1,6 @@
 // KIND: STANDALONE_LLDB
 // FREE_COMPILER_ARGS: -Xg-generate-debug-trampoline=enable
-// LLDB_TRACE: kt33055.txt
+
 // FILE: kt33055.kt
 fun question(subject: String, names: Array<String> = emptyArray()): String {
     return buildString { // breakpoint here