app update issues on Windows

Several bugs specifically involve QML dialog Components:

• the download progress dialog autocloses
• rejecting (canceling) the download progress dialog produces a generic network error dialog
• QML warnings occur when setting the buttonRoles property of SimpleMessageDialog.qml

added platformwindows typebug ui/ux labels

assigned to @atraczyk

marked the checklist item the download progress dialog autocloses as completed

marked the checklist item rejecting (canceling) the download progress dialog produces a generic network error dialog as completed

marked the checklist item QML warnings occur when setting the buttonRoles property of SimpleMessageDialog.qml as completed

closed

mentioned in commit a950a3f9

mentioned in commit 0087f1b8

mentioned in commit c19af7f9

mentioned in commit 3c279b29