Update signals/slots to match upstream changes

Signed-off-by: Alex Peterson <26804013+AMZN-alexpete@users.noreply.github.com>

Code/Tools/ProjectManager/Source/GemCatalog/GemCatalogHeaderWidget.cpp

@@ -261,7 +261,7 @@ namespace O3DE::ProjectManager
             }
         };
 
-        auto downloadEnded = [=](bool /*success*/, const QString& /*gemName*/)
+        auto downloadEnded = [=](const QString& /*gemName*/, bool /*success*/)
         {
             update(0); // update the list to remove the gem that has finished
         };

Code/Tools/ProjectManager/Source/GemCatalog/GemCatalogScreen.cpp

@@ -459,7 +459,7 @@ namespace O3DE::ProjectManager
         emit ChangeScreenRequest(ProjectManagerScreen::GemRepos);
     }
 
-    void GemCatalogScreen::OnGemDownloadResult(bool succeeded, const QString& gemName)
+    void GemCatalogScreen::OnGemDownloadResult(const QString& gemName, bool succeeded)
     {
         if (succeeded)
         {

Code/Tools/ProjectManager/Source/GemCatalog/GemCatalogScreen.h

@@ -49,7 +49,7 @@ namespace O3DE::ProjectManager
         void OnGemStatusChanged(const QString& gemName, uint32_t numChangedDependencies);
         void OnAddGemClicked();
         void SelectGem(const QString& gemName);
-        void OnGemDownloadResult(bool succeeded, const QString& gemName);
+        void OnGemDownloadResult(const QString& gemName, bool succeeded = true);
         void Refresh();
 
     protected: