Don't use dynamic text for navbar view

// FREEBIE

Signal/src/ViewControllers/MediaPageViewController.swift

@@ -573,7 +573,7 @@ class MediaPageViewController: UIPageViewController, UIPageViewControllerDataSou
     lazy private var headerNameLabel: UILabel = {
         let label = UILabel()
         label.textColor = .white
-        label.font = .ows_dynamicTypeBody()
+        label.font = UIFont.ows_regularFont(withSize: 17)
         label.textAlignment = .center
         label.adjustsFontSizeToFitWidth = true
         label.minimumScaleFactor = 0.8
@@ -584,7 +584,7 @@ class MediaPageViewController: UIPageViewController, UIPageViewControllerDataSou
     lazy private var headerDateLabel: UILabel = {
         let label = UILabel()
         label.textColor = .white
-        label.font = UIFont.preferredFont(forTextStyle: .caption1)
+        label.font = UIFont.ows_regularFont(withSize: 12)
         label.textAlignment = .center
         label.adjustsFontSizeToFitWidth = true