Fix some sizes in layouts

resources/qml/ImageButton.qml

@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-pragma ComponentBehavior
+pragma ComponentBehavior: Bound
 import "./ui"
 import QtQuick 2.3
 import QtQuick.Controls 2.3

resources/qml/voip/PlaceCall.qml

@@ -67,8 +67,8 @@ Popup {
 
             Avatar {
                 Layout.rightMargin: cameraCombo.visible ? 16 : 64
-                width: Nheko.avatarSize
-                height: Nheko.avatarSize
+                Layout.preferredWidth: Nheko.avatarSize
+                Layout.preferredHeight: Nheko.avatarSize
                 url: room.roomAvatarUrl.replace("mxc://", "image://MxcImage/")
                 displayName: room.roomName
                 roomid: room.roomId