Fix light/dark mode

Screenshottr/AppDelegate.swift

@@ -56,6 +56,10 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         
         // Create NSImage from the CGImage using the new size
         let imageWithNewSize = NSImage(cgImage: imageRef!, size: newSize)
+        // This allows us to ignore dark/light mode and have the system convert.
+        // The PDF view does not appear to account for the current system
+        // appearance.
+        imageWithNewSize.isTemplate = true
         
         statusItem.button!.image = imageWithNewSize
     }