Fix "Compile" button in toolbar using legacy hot reload when live coding startup is set to manual.

#rb none
#jira UE-71359

#ROBOMERGE-OWNER: lina.halper
#ROBOMERGE-AUTHOR: ben.marsh
#ROBOMERGE-SOURCE: CL 5361201 in //UE4/Release-4.22/... via CL 5368484
#ROBOMERGE-BOT: ANIM (Main -> Dev-Anim)

[CL 5381899 by ben marsh in Dev-Anim branch]

Engine/Source/Developer/Windows/LiveCoding/Private/LiveCodingModule.cpp

@@ -25,6 +25,7 @@ FString GLiveCodingConsoleArguments;
 
 FLiveCodingModule::FLiveCodingModule()
 	: bEnabledLastTick(false)
+	, bEnabledForSession(false)
 	, bStarted(false)
 {
 }
@@ -135,9 +136,15 @@ void FLiveCodingModule::EnableForSession(bool bEnable)
 			LppSetVisible(false);
 		}
 	}
+	bEnabledForSession = bEnable;
 }
 
 bool FLiveCodingModule::IsEnabledForSession() const
+{
+	return bEnabledForSession;
+}
+
+bool FLiveCodingModule::HasStarted() const
 {
 	return bStarted;
 }