K2: rename FakeOverrideTypeCalculator to CallableCopyTypeCalculator

This commits performs a rename.
According to KT-61443 this calculator is applicable not only to
fake (substitution/intersection) overrides.

compiler/fir/java/src/org/jetbrains/kotlin/fir/scopes/jvm/JvmMappedScope.kt

@@ -294,7 +294,7 @@ class JvmMappedScope(
             newTypeParameters = null,
             newContextReceiverTypes = emptyList(),
             isExpect = false,
-            fakeOverrideSubstitution = null
+            callableCopySubstitutionForTypeUpdater = null
         )
         return newSymbol
     }