fix paste not working in firefox

fix paste always going into txt2img field

javascript/dragdrop.js

@@ -43,7 +43,7 @@ function dropReplaceImage( imgWrap, files ) {
 window.document.addEventListener('dragover', e => {
     const target = e.composedPath()[0];
     const imgWrap = target.closest('[data-testid="image"]');
-    if ( !imgWrap ) {
+    if ( !imgWrap && target.placeholder != "Prompt") {
         return;
     }
     e.stopPropagation();

javascript/imageParams.js

@@ -2,21 +2,18 @@ window.onload = (function(){
     window.addEventListener('drop', e => {
         const target = e.composedPath()[0];
         const idx = selected_gallery_index();
-        let prompt_target = "txt2img_prompt_image";
-        if (idx === 1) {
-            prompt_target = "img2img_prompt_image";
-        }
-        if (target.placeholder === "Prompt") {
-            e.stopPropagation();
-            e.preventDefault();
-            const imgParent = gradioApp().getElementById(prompt_target);
-            const files = e.dataTransfer.files;
-            const fileInput = imgParent.querySelector('input[type="file"]');
-            if ( fileInput ) {
-                fileInput.files = files;
-                fileInput.dispatchEvent(new Event('change'));
-            }
+        if (target.placeholder != "Prompt") return;
+
+        let prompt_target = get_tab_index('tabs') == 1 ? "img2img_prompt_image" : "txt2img_prompt_image";
+
+        e.stopPropagation();
+        e.preventDefault();
+        const imgParent = gradioApp().getElementById(prompt_target);
+        const files = e.dataTransfer.files;
+        const fileInput = imgParent.querySelector('input[type="file"]');
+        if ( fileInput ) {
+            fileInput.files = files;
+            fileInput.dispatchEvent(new Event('change'));
         }
     });
-
-});
+});
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