Fixes #228

[viktormaar]

I don´t exactly know the intention of the sale price usage, but made a fix for the https://github.com/jsdecena/laracom/issues/228 anyways.

• The sale price now saves to the database, as a float number
• If the attribute marked as default price, the sale price shows on the product list
• The attribute dropdown shows the sale price (if any)
• Both the cart and the order use the sale price

[codecov[bot]]

Codecov Report

Merging #265 (080d19c) into master (6130250) will decrease coverage by 0.06%. The diff coverage is 57.14%.

@@             Coverage Diff              @@
##             master     #265      +/-   ##
============================================
- Coverage     79.95%   79.88%   -0.07%     
- Complexity      606      607       +1     
============================================
  Files           129      129              
  Lines          2135     2138       +3     
============================================
+ Hits           1707     1708       +1     
- Misses          428      430       +2     

Impacted Files	Coverage Δ
...t/app/Shop/Orders/Repositories/OrderRepository.php	94.36% <33.33%> (-2.70%)	:arrow_down:
...p/Controllers/Admin/Products/ProductController.php	94.40% <66.66%> (ø)
...ject/app/Http/Controllers/Front/CartController.php	92.30% <100.00%> (ø)

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