Unable to use TWeakObjectPtrs for the optional Old value for a repnotify function

A user has reported that Unreal Header Tool fails to parse a rep notify function properly when the optional parameter for the Old value is populated with a TWeakObjectPointer.

Example of errors:

Severity	Code	Description	Project	File	Line	Suppression State
Error	C2275	'TWeakObjectPtr<UObject,FWeakObjectPtr>': illegal use of this type as an expression	MyProject16	d:\unreal projects\main\myproject16\source\myproject16\MyActor.h	12	
Error	C2065	'Z_Param_OldSource': undeclared identifier	MyProject16	d:\unreal projects\main\myproject16\source\myproject16\MyActor.h	12	
Error	C3861	'P_GET_WEAKOBJECT': identifier not found	MyProject16	d:\unreal projects\main\myproject16\source\myproject16\MyActor.h	12	

Regression?: No
This occurred in 4.19

1. Create a new C++ project
2. Create a new C++ class based off of Actor
3. In the .h file for the new class, add the following lines of code

    	UPROPERTY(Transient, ReplicatedUsing = "OnRep_Source")
   		TWeakObjectPtr<UObject> Source;
   
   	UFUNCTION()
   		void OnRep_Source(const TWeakObjectPtr<UObject> OldSource); 

4. Compile the project
   Result: The compilation fails with multiple errors, due to the TWeakObjectPtr in the parameters for OnRep_Source
   Expected: The compilation succeeds

Fix UE-51650

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