[Glitch] Fix drag and drop link to composebox

Port 3abe003f59 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/features/ui/index.js

@@ -320,7 +320,7 @@ class UI extends React.Component {
   }
 
   dataTransferIsText = (dataTransfer) => {
-    return (dataTransfer && Array.from(dataTransfer.types).includes('text/plain') && dataTransfer.items.length === 1);
+    return (dataTransfer && Array.from(dataTransfer.types).filter((type) => type === 'text/plain').length === 1);
   }
 
   closeUploadModal = () => {