mobile/qml: make close dialog in Connect work

When using Connect, the context is switched, so close()
might or might not work.

Change unqualified close() to qualified uploadDialog.close()

Signed-off-by: Jan Iversen <jan@casacondor.com>

mobile-widgets/qml/Export.qml

@@ -94,7 +94,7 @@ Kirigami.ScrollablePage {
 			onUploadFinish: {
 				if (success) {
 					pageStack.pop()
-					close()
+					uploadDialog.close()
 				}
 				statusText.text = text
 				progress.value = 0