Make frio the default theme

static/settings.config.php

@@ -58,7 +58,7 @@ return [
 
 		// allowed_themes (Comma-separated list)
 		// Themes users can change to in their settings.
-		'allowed_themes' => 'quattro,vier,duepuntozero,smoothly',
+		'allowed_themes' => 'frio,quattro,vier,duepuntozero,smoothly',
 
 		// curl_timeout (Integer)
 		// Value is in seconds. Set to 0 for unlimited (not recommended).
@@ -184,7 +184,7 @@ return [
 
 		// theme (String)
 		// System theme name.
-		'theme' => 'vier',
+		'theme' => 'frio',
 
 		// url (String)
 		// The fully-qualified URL of this Friendica node.

tests/datasets/config/.htconfig.php

@@ -49,7 +49,7 @@ $a->config['php_path'] = '/another/php';
 $a->config['system']['huburl'] = '[internal]';
 
 // allowed themes (change this from admin panel after installation)
-$a->config['system']['allowed_themes'] = 'quattro,vier,duepuntozero';
+$a->config['system']['allowed_themes'] = 'frio,quattro,vier,duepuntozero';
 
 // default system theme
 $a->config['system']['theme'] = 'frio';

tests/src/Util/Config/ConfigFileLoaderTest.php

@@ -176,7 +176,7 @@ class ConfigFileLoaderTest extends MockedTest
 		self::assertEquals('999', $configCache->get('config', 'max_import_size'));
 		self::assertEquals('666', $configCache->get('system', 'maximagesize'));
 
-		self::assertEquals('quattro,vier,duepuntozero', $configCache->get('system', 'allowed_themes'));
+		self::assertEquals('frio,quattro,vier,duepuntozero', $configCache->get('system', 'allowed_themes'));
 		self::assertEquals('1', $configCache->get('system', 'no_regfullname'));
 	}