[torconnect] Update error red to #e22850 for light and #ff848b for dark mode

The situation with error colors in Firefox is confusing, but I think we should to start using the following reds across the board for consistency:

Light mode:

• Default: #e22850
• Hover: #c50042
• Pressed: #810220

Dark mode:

• Default: #ff848b
• Hover: #ffbdc5
• Pressed: #ffdfe7

(See the conversation we had here for background: !254 (comment 2779675))