[FIR] Fix CLI tests to prevent non-relevant errors from appearing

compiler/testData/cli/jvm/extendedCheckers.kt

@@ -1,3 +1,4 @@
-fun foo() {
+fun foo(p: Int) {
     val i: Int = 1
+    foo(i)
 }

compiler/testData/cli/jvm/extendedCheckersNoWarning.kt

@@ -1,3 +1,4 @@
-fun foo() {
+fun foo(p: String) {
     val s = "Say 'Hi!' to extended checkers"
+    foo(s)
 }