[max7219digit] support flip_x when rotate_chip is 90° or 270°

[Tugzrida]

What does this implement/fix?

The flip_x option of max7219digit was only implemented when rotate_chip was 0 or 180. This adds the implementation for 90 and 270. I've tested all 8 combinations of flip_x and rotate_chip locally and they work as expected.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Related issue or feature (if applicable): none found

Pull request in esphome-docs with documentation (if applicable): n/a

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx

Example entry for config.yaml:

# Example config.yaml
spi:
  clk_pin: GPIO7
  mosi_pin: GPIO6

display:
  - platform: max7219digit
    cs_pin: GPIO5
    num_chips: 5
    reverse_enable: true
    flip_x: true
    rotate_chip: 270
    lambda: |-
        it.printdigit("12345");

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.

[probot-esphome]

Hey there @rspaargaren, mind taking a look at this pull request as it has been labeled with an integration (max7219digit) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.21%. Comparing base (4d8b5ed) to head (58893de).
Report is 603 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6109      +/-   ##
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+ Coverage   53.70%   54.21%   +0.50%     
==========================================
  Files          50       50              
  Lines        9408     9594     +186     
  Branches     1654     1691      +37     
==========================================
+ Hits         5053     5201     +148     
- Misses       4056     4069      +13     
- Partials      299      324      +25     

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