[FIR] Fix tests (ARGUMENT_TYPE_MISMATCH instead of INCOMPATIBLE_CANDIDATE)

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/QualifiedExpression.fir.kt

@@ -7,7 +7,7 @@ class A {
 fun foo() {
     val x: Int? = null
 
-    A().<!INAPPLICABLE_CANDIDATE!>bar<!>(x)
+    A().bar(<!ARGUMENT_TYPE_MISMATCH!>x<!>)
     if (x == null) return
     A().bar(x)
 }