fix magic number

SessionUIKit/Style Guide/Values.swift

@@ -47,6 +47,6 @@ public final class Values : NSObject {
     @objc public static let iPadModalWidth = UIScreen.main.bounds.width / 2
     @objc public static let iPadButtonWidth = CGFloat(196)
     @objc public static let iPadButtonSpacing = CGFloat(32)
-    @objc public static let iPadUserSessionIdContainerWidth = CGFloat(424) // iPadButtonWidth * 2 + iPadButtonSpacing
-    @objc public static let iPadButtonContainerMargin = UIScreen.main.bounds.width / 2 - 236 // ScreenWidth / 2 - iPadButtonSpacing / 2 - iPadButtonWidth - largeSpacing
+    @objc public static let iPadUserSessionIdContainerWidth = iPadButtonWidth * 2 + iPadButtonSpacing
+    @objc public static let iPadButtonContainerMargin = (UIScreen.main.bounds.width - iPadButtonSpacing) / 2 - iPadButtonWidth - largeSpacing
 }