Revert "make disabled prop reactive"

This reverts commit 7d4b1cc.

Author: arackaf

src/components/Dropzone.svelte

@@ -242,11 +242,17 @@
     resetState();
   }
 
-  $: composeHandler = fn => (disabled ? null : fn);
+  function composeHandler(fn) {
+    return disabled ? null : fn;
+  }
 
-  $: composeKeyboardHandler = fn => (noKeyboard ? null : composeHandler(fn));
+  function composeKeyboardHandler(fn) {
+    return noKeyboard ? null : composeHandler(fn);
+  }
 
-  $: composeDragHandler = fn => (noDrag ? null : composeHandler(fn));
+  function composeDragHandler(fn) {
+    return noDrag ? null : composeHandler(fn);
+  }
 
   function stopPropagation(event) {
     if (noDragEventsBubbling) {