Fix simulator QR Codes

[tadeubas]

What is this PR for?

The Simulator had issues when encoding data into QR codes and when reading QR codes via pyzbar. This PR fixes both problems and restores reliable QR round-trips 😄.

Removed the unnecessary qr_str_to_bytes that was trying to solve those issues.

How to test:

• Use the Simulator to display a QR code.
• Take a photo with a phone (or other camera).
• Read the QR using the Datum tool inside the Simulator.

from krux.qr import to_qr_codes, FORMAT_NONE
from krux.themes import theme, WHITE
from krux.display import display
from krux.input import Input


qr_foreground = WHITE if theme.bg_color == WHITE else None
inp = Input()

data = " woahdi oawij dowaij ,./:[]123! áéíóú àè ìò ù©ç ãẽĩ õũ?"
code_generator = to_qr_codes(data, 999999999, FORMAT_NONE)
code, num_parts = next(code_generator)

# Draw QR code
if qr_foreground:
    display.draw_qr_code(
        code, light_color=qr_foreground
    )
else:
    display.draw_qr_code(code)

Changes made to:

• Code
• Tests
• Docs
• CHANGELOG

Did you build the code and tested on device?

• Yes, build and tested on

What is the purpose of this pull request?

• Bug fix
• New feature
• Docs update
• Other