NoUserNamePopup: new design

GitLab: #1417
Change-Id: I6abc313f78ca37b9cce76137f85c4a9656b98feb

src/app/wizardview/components/NoUsernamePopup.qml

@@ -52,14 +52,12 @@ BaseModalDialog {
     button1.onClicked: root.close()
 
     popupContent: Text {
-                Layout.fillWidth: true
-                Layout.preferredWidth: 280
-                Layout.leftMargin: 20
-                Layout.rightMargin: 20
-                Layout.alignment: Qt.AlignLeft
+                width: root.width - 2 * root.popupMargins
                 font.pixelSize: JamiTheme.popuptextSize
+
                 lineHeight: JamiTheme.wizardViewTextLineHeight
                 wrapMode: Text.WordWrap
+
                 color: JamiTheme.textColor
                 text: JamiStrings.joinJamiNoPassword
         }