Added new category buttons to certian dropdowns to quickly add a category without going to setting then category also a few fixes here and there

expenses.php

@@ -188,6 +188,6 @@ $num_rows = mysqli_fetch_row(mysqli_query($mysqli,"SELECT FOUND_ROWS()"));
 </div>
 
 <?php include("add_expense_modal.php"); ?>
-<?php include("add_category_modal.php"); ?>
+<?php include("add_quick_modal.php"); ?>
 
 <?php include("footer.php");