Change fill to white to match other icons.

[rexbron]

Fixes #703

[juliushaertl]

The dark icon would still be needed, so maybe you can put it as circles-dark.svg and make sure that it is used in the places where the current one was used before:

lib/Notification/Notifier.php 150: $iconPath = $this->urlGenerator->imagePath(Application::APP_ID, 'circles.svg');

lib/Activity/Filter.php 54: $this->url->imagePath(Application::APP_ID, 'circles.svg')

lib/UnifiedSearch/UnifiedSearchProvider.php 163: $iconPath = $this->urlGenerator->imagePath(Application::APP_ID, 'circles.svg');

lib/Model/ShareWrapper.php 688: $urlGenerator->imagePath(Application::APP_ID, 'circles.svg')

[rexbron]

@juliushaertl Hi!

A separate icon for a dark theme is not required; the dark theme expects a pure white filled icon which it then styles:

This behavior is consistent with other 1st party apps in Nextcloud.

[juliushaertl]

It is not about the dark theme but other places where the icon is used like notifications or activity. There a dark icon variant would still be required.

[Altahrim]

Done in another PR