**Problem:**
when in a bar/restaurant point of sale
if the tip is added after the payment the
total amount and remaining amount are not correct

**Steps to reproduce:**
- Navigate to Point of Sale/Configuration/Point of Sale
- Create a new point of sale
- In settings, activate the setting "Is a Bar/Restaurant" for this point of sale
- Acivate the setting "Tips" for this point of sale
- make sure the cash payment method is available for this point of sale
- in Point of Sales/Dashboard clik on open regiser for the new point of sale
- Create a new order, select a product, click on payment
- Select cash, on enter an amount over the total value
- Click on Tip, and select Ok (the default amount should be the difference between the total and the cash amount you entered

**Current behavior:**
 The Amount of cash has been increased by the amount of the tip

**Expected behavior:**
The cash amount shouldn't be impacted by the tip

**Cause of the issue:**
When adding the tip inside the addTip method, when settip 
is triggered, the tip is added as a new PosOrderLine inside the order
https://github.com/odoo/odoo/blob/68940a80a64cd81679ad94d488623a471e2c926f/addons/point_of_sale/static/src/app/services/pos_store.js#L636
which modifies total due amount

Then the Pos Payment amount is modified
https://github.com/odoo/odoo/blob/68940a80a64cd81679ad94d488623a471e2c926f/addons/point_of_sale/static/src/app/screens/payment_screen/payment_screen.js#L248
which should not happen when the tip is smaller 
or equal to the remaining amount (if you by something worth 15
,give 20 euros and add a 5 euros tip, the payment amount should
stay 20)

**Fix:**
There is 3 cases.
Case 1: the remaining is negative, then if a tip is added 
it should increase the payment amount
Case 2: the remaining is positive (meaning the client paid 
more than total due) and the tip is lower or equal to the 
remaining, then the payment amount should not increase
Case3: the remaining is positive and the tip is higher than the 
remaining, the payment amount should be increased by the 
difference between tip and remaining

opw-4721864