Add -Xuse-fir-lt=false to some scripting tests

make them compatible with K2

prepare/compiler-client-embeddable/tests/kotlin/org/jetbrains/kotlin/compiler/client/CompilerClientIT.kt

@@ -80,7 +80,7 @@ class CompilerClientIT {
     fun testSimpleScript() {
         val (out, code) = runCompiler(
                 "-cp", compilationClasspath.joinToString(File.pathSeparator) { it.canonicalPath },
-                "-Xallow-any-scripts-in-source-roots",
+                "-Xuse-fir-lt=false", "-Xallow-any-scripts-in-source-roots",
                 File("testData/scripts/simpleHelloWorld.kts").canonicalPath)
         assertEquals(0, code, "compilation failed:\n" + out + "\n")
     }