Fix internal Linter warnings #trivial (#340)

* Fix internal Linter warnings

* Remove explicit copy for block as let us just use the default one

Source/ASDisplayNode+Subclasses.h

@@ -122,7 +122,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @warning Subclasses must not override this; it returns the last cached layout and is never expensive.
  */
-@property (nullable, nonatomic, readonly, assign) ASLayout *calculatedLayout;
+@property (nullable, nonatomic, readonly, strong) ASLayout *calculatedLayout;
 
 #pragma mark - View Lifecycle
 /** @name View Lifecycle */

Source/ASDisplayNode.h

@@ -646,12 +646,12 @@ extern NSInteger const ASDefaultDrawingPriority;
 #if TARGET_OS_IOS
 @property (nonatomic, assign, getter=isExclusiveTouch) BOOL exclusiveTouch;    // default=NO
 #endif
-@property (nonatomic, assign, nullable) CGColorRef shadowColor;                // default=opaque rgb black
+@property (nonatomic, nullable)         CGColorRef shadowColor;                // default=opaque rgb black
 @property (nonatomic, assign)           CGFloat shadowOpacity;                 // default=0.0
 @property (nonatomic, assign)           CGSize shadowOffset;                   // default=(0, -3)
 @property (nonatomic, assign)           CGFloat shadowRadius;                  // default=3
 @property (nonatomic, assign)           CGFloat borderWidth;                   // default=0
-@property (nonatomic, assign, nullable) CGColorRef borderColor;                // default=opaque rgb black
+@property (nonatomic, nullable)         CGColorRef borderColor;                // default=opaque rgb black
 
 // UIResponder methods
 // By default these fall through to the underlying view, but can be overridden.

Source/Details/ASImageProtocols.h

@@ -163,7 +163,7 @@ withDownloadIdentifier:(id)downloadIdentifier;
 /**
  @abstract A block which receives the cover image. Should be called when the objects cover image is ready.
  */
-@property (nonatomic, strong, readwrite) void (^coverImageReadyCallback)(UIImage *coverImage);
+@property (nonatomic, readwrite) void (^coverImageReadyCallback)(UIImage *coverImage);
 
 /**
  @abstract Returns whether the supplied data contains a supported animated image format.
@@ -209,7 +209,7 @@ withDownloadIdentifier:(id)downloadIdentifier;
 /**
  @abstract Should be called when playback is ready.
  */
-@property (nonatomic, strong, readwrite) dispatch_block_t playbackReadyCallback;
+@property (nonatomic, readwrite) dispatch_block_t playbackReadyCallback;
 
 /**
  @abstract Return the image at a given index.

Source/Layout/ASLayoutElement.h

@@ -72,7 +72,7 @@ typedef NS_ENUM(NSUInteger, ASLayoutElementType) {
 /**
  * @abstract A size constraint that should apply to this ASLayoutElement.
  */
-@property (nonatomic, assign, readonly) ASLayoutElementStyle *style;
+@property (nonatomic, strong, readonly) ASLayoutElementStyle *style;
 
 /**
  * @abstract Returns all children of an object which class conforms to the ASLayoutElement protocol