Account menu in top right corner inverts profile picture colour

[ghost]

Please make sure all of the following is true so your issue can be quickly resolved (check like [X]):

• My version of the userstyle is up to date
• My version of Stylus is up to date
• I have searched the existing issues (both open and closed) to see if my problem is already reported.
• I have added what browser I use and its version.
• I have given a detailed description of the problem and the steps to reach it.
• I have added an example URL where the problem occurs.
• If I have customized any of the options, I have pinned down with which of them it occurs and provided the changed values here.
• I have saved the page the problem occurs on and attached it here (usually available in the browser context menu - make sure to log out beforehand to preserve your privacy!).
• I have made a screenshot that demonstrates the problem and attached it here.

Userstyle: Search
Stylus version: 1.5.3
Userstyle version: 0.7.29
Browser version: 73.0.3683.103
Steps to reach the problem:

1. Login to google.com
2. Look at the top right corner, or open the account context menu

Expected Behavior: Profle picture should not be colour-inverted.
Observed Behavior: Profile picture is colour-inverted.
URL: google.com
Customized values that cause the problem: None (using all defaults)
Saved page: (idk how to do this without logging in since it's related to the profile picture of the account)
Screenshot:

[allanf181]

[skeets23]

I just now fixed this in #35 -- please accept pull request or make a similar change.