[iOS] Minor Navigational Issues in Course Content

[moiz994]

Having implemented a navigational pattern following the production edX app, some issues have been created within the navigational flow of course content from the UX point of view.

• The next previous button are with up and down arrow
• The next component is also either up or down in the UI
• But the unit progress bar is horizontal and it moves horizontally
• The “Good work” banner shows “Next section ->” button with a right arrow