[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.cpp

@@ -21,4 +21,9 @@ namespace O3DE::ProjectManager
         connect(browseButton, &QPushButton::pressed, this, &FormBrowseEditWidget::HandleBrowseButton);
         m_frameLayout->addWidget(browseButton); 
     }
+
+    FormBrowseEditWidget::FormBrowseEditWidget(const QString& labelText, QWidget* parent)
+        : FormBrowseEditWidget(labelText, "", parent)
+    {
+    }
 } // namespace O3DE::ProjectManager