Remove unused style measurements

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

theme/Style/Style.qml

@@ -93,14 +93,10 @@ QtObject {
     property double trayFoldersMenuButtonDropDownCaretIconSizeFraction: 0.3
     property double trayFoldersMenuButtonMainIconSizeFraction: 1.0 - trayFoldersMenuButtonDropDownCaretIconSizeFraction
 
-    property int addAccountButtonHeight: 50
-
     property int activityListButtonWidth: 42
     property int activityListButtonHeight: 32
     property int activityListButtonIconSize: 18
     property int headerButtonIconSize: 48
-    property int addButtonIconSize: 26
-    property int dismissButtonSize: 26
     property int minimumActivityItemHeight: 24
 
     property int accountIconsMenuMargin: 7