Fix theme colour in HTML meta

CHANGELOG.rst

@@ -13,6 +13,7 @@ Fixed
 ~~~~~
 
 * PDF generation failed with S3 storage due to incompatibility with boto3
+* PWA theme colour defaulted to red
 
 `2.7`_ - 2022-01-24
 -------------------

aleksis/core/templates/core/partials/meta.html

@@ -6,7 +6,7 @@
 <meta name="description" content="{{ SITE_PREFERENCES.general__description }}"/>
 <meta name="generator" content="AlekSIS School Information System"/>
 
-<meta name="theme-color" content="red">
+<meta name="theme-color" content="{{ SITE_PREFERENCES.theme__primary }}">
 <meta name="mobile-web-app-capable" content="yes">
 
 <meta name="apple-mobile-web-app-title" content="{{ SITE_PREFERENCES.general__title }}">
@@ -32,5 +32,3 @@
 {% with icon=PWA_ICONS.apple_splash.192 %}
   <link href="{{ icon.faviconImage.url }}" media="(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image"/>
 {% endwith %}
-
-