K2 Scripting: allow script top level inline functions

compiler/testData/codegen/script/inline.kts

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_K2: JVM_IR
 
 // expected: rv: 2
 inline fun foo(l: (Int) -> Int ): Int {

compiler/testData/diagnostics/tests/script/topLevelInlineFun.kts

@@ -0,0 +1,5 @@
+// FIR_IDENTICAL
+
+inline fun foo(f: () -> Unit) {
+    f()
+}