style: centered positioning and alignment added to modal and userpopup components

- Added centered positioning to Modal component in PromptPopup.
- Added centered alignment to UserPopup component.

src/renderer/src/components/Popups/PromptPopup.tsx

@@ -40,7 +40,7 @@ const PromptPopupContainer: React.FC<Props> = ({
   }
 
   return (
-    <Modal title={title} open={open} onOk={onOk} onCancel={handleCancel} afterClose={onClose}>
+    <Modal title={title} open={open} onOk={onOk} onCancel={handleCancel} afterClose={onClose} centered>
       <Box mb={8}>{message}</Box>
       <Input
         placeholder={inputPlaceholder}

src/renderer/src/components/Popups/UserPopup.tsx

@@ -44,7 +44,8 @@ const PopupContainer: React.FC<Props> = ({ resolve }) => {
       onOk={onOk}
       onCancel={onCancel}
       afterClose={onClose}
-      transitionName="ant-move-down">
+      transitionName="ant-move-down"
+      centered>
       <Center mt="30px">
         <Upload
           customRequest={() => {}}