Increase size of dismiss button

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

theme/Style/Style.qml

@@ -85,7 +85,7 @@ QtObject {
     property int addAccountButtonHeight: 50
 
     property int headerButtonIconSize: 32
-    property int dismissButtonSize: 24
+    property int dismissButtonSize: 26
     property int minimumActivityItemHeight: 24
 
     property int activityLabelBaseWidth: 240