address all the swiftlint errors (#1129)

.swiftlint.yml

@@ -1,4 +1,4 @@
-whitelist_rules:
+only_rules:
   # Delegate protocols should be class-only so they can be weakly referenced.
   - class_delegate_protocol
 

ios/FluentUI.Demo/FluentUI.Demo/Demos/AvatarDemoController.swift

@@ -334,7 +334,7 @@ class AvatarDemoController: DemoTableViewController {
             presence = presenceIterator.next()
         }
 
-        if presence! ==  .none {
+        if presence! == .none {
             presence = presenceIterator.next()
         }
 

ios/FluentUI/Navigation/BadgeLabelButton.swift

@@ -65,7 +65,7 @@ class BadgeLabelButton: UIButton {
 
     private var badgeFrameOriginX: CGFloat {
         let xOrigin: CGFloat = isLeftToRightUserInterfaceLayoutDirection ?
-            frame.size.width - contentEdgeInsets.left  :
+            frame.size.width - contentEdgeInsets.left :
             contentEdgeInsets.left
 
         return (xOrigin - badgeWidth / 2)

macos/FluentUI/Link/Link.swift

@@ -137,7 +137,7 @@ open class Link: NSButton {
 	private let cornerRadius: CGFloat = 2
 
 	private func updateTitle() {
-		let titleAttributes = (isEnabled && showsUnderlineWhileMouseInside && mouseInside) ? underlinedLinkAttributes: linkAttributes
+		let titleAttributes = (isEnabled && showsUnderlineWhileMouseInside && mouseInside) ? underlinedLinkAttributes : linkAttributes
 		attributedTitle = NSAttributedString(string: title, attributes: titleAttributes)
 		setAccessibilityTitle(title)
 	}