FIR: Fix ambiguity for invoke candidates on qualifier receiver

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/invokePriority.kt

@@ -29,6 +29,6 @@ class E {
 }
 
 fun main() {
-    E.<!AMBIGUITY!>f<!>() // Resolves to (2) in old FE (ambiguity in FIR)
+    E.f() // Resolves to (2) in old FE (Resolves to (1) in FIR)
     E.f.invoke() // Resolves to (1)
 }

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/invokePriority.txt

@@ -74,6 +74,6 @@ FILE: invokePriority.kt
 
     }
     public final fun main(): R|kotlin/Unit| {
-        Q|E|.<Ambiguity: f, [/E.f.invoke, kotlin/Function0.invoke]>#()
+        Q|E.f|.R|/E.f.invoke|()
         Q|E.f|.R|/E.f.invoke|()
     }