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

@@ -2,11 +2,10 @@ 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") {
+        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);
@@ -16,7 +15,5 @@ window.onload = (function(){
             fileInput.files = files;
             fileInput.dispatchEvent(new Event('change'));
         }
-        }
     });
-
 });