fix: make webview background transparent to prevent obscuring items behind it

Author: CodeSchwert

src/Packages/Passport/Prefabs/PassportLogin_Vuplex.prefab

@@ -161,7 +161,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   m_Material: {fileID: 0}
-  m_Color: {r: 1, g: 1, b: 1, a: 1}
+  m_Color: {r: 1, g: 1, b: 1, a: 0}
   m_RaycastTarget: 1
   m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
   m_Maskable: 1

src/Packages/Passport/Prefabs/PassportLogin_Windows.prefab

@@ -124,7 +124,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   m_Material: {fileID: 0}
-  m_Color: {r: 1, g: 1, b: 1, a: 1}
+  m_Color: {r: 1, g: 1, b: 1, a: 0}
   m_RaycastTarget: 1
   m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
   m_Maskable: 1