minor improvements

Session/Shared/BaseVC.swift

@@ -1,4 +1,3 @@
-import SessionUIKit
 
 class BaseVC : UIViewController {
     private var hasGradient = false
@@ -83,7 +82,7 @@ class BaseVC : UIViewController {
         headingImageView.image = UIImage(named: "SessionHeading")?.withRenderingMode(.alwaysTemplate)
         headingImageView.contentMode = .scaleAspectFit
         headingImageView.set(.width, to: 150)
-        headingImageView.set(.height, to: 20)
+        headingImageView.set(.height, to: Values.largeFontSize)
         navigationItem.titleView = headingImageView
     }