Remove unneeded replace

www.photopea.com/code/storages/dropboxStorage.html

@@ -165,7 +165,8 @@
 		    		while(j < 25 && ii < out.length)
 		    		{
 		    			//could just check names from metadata, probably faster than .includes
-		    			if(thumbnailExtenstions.includes(out[ii][0].split('.').pop()))
+						var pts = out[ii][0].split('.');
+		    			if(pts.length>1 && thumbnailExtenstions.includes(pts.pop()))
 						{
 							out[ii].push(response.result.entries[j].thumbnail)
 		    				++j