Adjust leading inset for primary button

The size of the secondary button wasn't being used to adjust the insets
of the disconnect button. I've gone and done did make it do it now.
Feel free to reject or suggest a better solution.

ios/MullvadVPN/View controllers/Tunnel/DisconnectSplitButton.swift

@@ -42,6 +42,8 @@ class DisconnectSplitButton: UIView {
             secondaryButton.heightAnchor.constraint(equalToConstant: secondaryButtonSize.height)
         }
 
+        primaryButton.configuration?.contentInsets.leading += UIMetrics.DisconnectSplitButton.secondaryButton.width
+
         // Ideally, we shouldn't need to manually resize the image ourselves.
         // However, since UIButton.Configuration doesn't provide a direct property
         // for controlling image scaling (like imageScaling or contentMode in other contexts),