Remove unused code (#590)

Author: SwiftlyNoah

Loop/Extensions/UIImage.swift

@@ -30,10 +30,6 @@ extension UIImage {
 
         return suffix
     }
-    
-    static func presetsImage(selected: Bool) -> UIImage? {
-        return UIImage(named: selected ? "presets-selected" : "presets")
-    }
 
     static func preMealImage(selected: Bool) -> UIImage? {
         return UIImage(named: selected ? "Pre-Meal Selected" : "Pre-Meal")

LoopUI/Extensions/UIColor.swift

@@ -18,8 +18,6 @@ extension UIColor {
 
     @nonobjc static let insulin = UIColor(named: "insulin") ?? systemOrange
 
-    @nonobjc static let preset = UIColor(named: "presets") ?? systemBlue
-
     // The loopAccent color is intended to be use as the app accent color.
     @nonobjc public static let loopAccent = UIColor(named: "accent") ?? systemBlue
 
@@ -52,8 +50,6 @@ extension UIColor {
 
     @nonobjc public static let insulinTintColor = insulin
 
-    @nonobjc public static let presetTintColor = preset
-
     @nonobjc public static let pumpStatusNormal = insulin
 
     @nonobjc public static let staleColor = critical