Assets/icon: Rm redundant PNG file

[ugtthis]

selfdrive/assets/offroad/icon_openpilot.png - This file gets deleted

• size: 43KB
• Icon used only in "Enable openpilot" settings toggle
• Current size when rendered 80x80 pixels - Refer to selfdrive/ui/qt/widgets/controls.cc
icon_pixmap = QPixmap(icon).scaledToWidth(80, Qt::SmoothTransformation);

selfdrive/assets/img_chffr_wheel.png

• size: 17KB
• Icon only used in onroad UI(icon in top right)
• Current size when rendered 144x144 pixels - Refer to selfdrive/ui/qt/onroad/buttons.h
const int btn_size = 192;
const int img_size = (btn_size / 4) * 3;

I removed icon_openpilot.png because its 532x532 px size is unnecessary for a small 80x80 px icon displayed on a 2160x1080 screen. img_chffr_wheel.png(266x266 px) is used for a larger 144x144 px icon but has a smaller file size. Quality of icon when using the smaller file size as the replacement, looks similar/the same to how the old icon rendered, as seen in video below.

Comparing files

Comparison video

comparing-old-and-new-icon.mp4

[github-actions]

UI Preview

onroad : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

All Screenshots

[sshane]

@deanlee know why the DM crosshair changes slightly here? Also can you add a screenshot of the toggles pane? That would help us verify this PR!

[VirtuallyChris]

Maybe it's time to rename the chffr wheel? That's such an old reference!