mac/input: rename old open file function to handleDnd

rename this function to represent better what it does. dnd events should
be handled by this one. generic open file events should be handled by
the newly introduced function in the apphub, with the same old name.

Author: Akemi

osdep/mac/input_helper.swift

@@ -249,11 +249,11 @@ class InputHelper: NSObject {
         return String(utf16CodeUnits: chars, count: length)
     }
 
-    @objc func open(files: [String], append: Bool = false) {
+    @objc func handleDnd(files: [String]) {
         lock.withLock {
             guard let input = input else { return }
 
-            open(files: files, append: append) { (filesPtr, action) in
+            open(files: files) { (filesPtr, action) in
                 mp_input_drop_files(input, Int32(files.count), &filesPtr, action)
             }
         }

video/out/mac/view.swift

@@ -92,7 +92,7 @@ class View: NSView, CALayerDelegate {
             }
         }
         if files.isEmpty { return false }
-        input?.open(files: files)
+        input?.handleDnd(files: files)
         return true
     }