[LYN-4938] Prism: Paths in Engine settings page do not use consistent slashes (#1721)

* Corrected focus for form line edit widgets.
* Consistent slash usage for folder browse edit widgets.

Signed-off-by: Benjamin Jillich <jillich@amazon.com>

Code/Tools/ProjectManager/Source/FormBrowseEditWidget.h

@@ -20,6 +20,7 @@ namespace O3DE::ProjectManager
 
     public:
         explicit FormBrowseEditWidget(const QString& labelText, const QString& valueText = "", QWidget* parent = nullptr);
+        explicit FormBrowseEditWidget(const QString& labelText = "", QWidget* parent = nullptr);
         ~FormBrowseEditWidget() = default;
 
     protected slots: