Use app.svg for the personal settings section icon

Was already pending in the working tree; committed unchanged.

lib/Settings/PersonalSection.php

@@ -29,6 +29,6 @@ class PersonalSection implements IIconSection {
 	}
 
 	public function getIcon(): string {
-		return $this->urlGenerator->imagePath(Application::APP_ID, 'app-dark.svg');
+		return $this->urlGenerator->imagePath(Application::APP_ID, 'app.svg');
 	}
 }