Changed submit to upload on the files page

Author: AverageTurtle

src/main/resources/html/files.html

@@ -47,7 +47,7 @@ <h2>Upload</h2>
         <option value="texture">Texture (.png)</option>
     </select>
     <input type="file" id="asset-file" name="asset-file">
-    <input type="submit">
+    <input type="submit", value="Upload">
 </form>
 
 <p>Run /packer rezip to update the pack!</p>