Restore button updates in partition page.

Summary: Restore the button update status matches the current state. This resolves T40 lp:#1823569

Test Plan: Verify in manual partitioning that the buttons are updated properly.

Reviewers: tsimonq2, wxl

Reviewed By: wxl

Maniphest Tasks: T40

Differential Revision: https://phab.lubuntu.me/D3

debian/changelog

@@ -1,3 +1,9 @@
+calamares (3.2.4-0ubuntu2) disco; urgency=medium
+
+  * Restore button updates in partition page (LP: #1823569).
+
+ -- Dan Simmons <kc2bez@lubuntu.me>  Mon, 08 Apr 2019 07:18:07 -0400
+
 calamares (3.2.4-0ubuntu1) disco; urgency=medium
 
   * New upstream release.

debian/patches/series

@@ -1,2 +1,3 @@
 0001-replace-pkexec-by-sudo.patch
 apport-package-hook.patch
+update-buttons.patch

debian/patches/update-buttons.patch

@@ -0,0 +1,16 @@
+Description: Restore button updates in partition module
+Author: Adriaan de Groot <groot@kde.org>
+Bug: https://github.com/calamares/calamares/issues/1097
+Applied-Upstream: https://github.com/calamares/calamares/commit/2b149fb944da8d975c05d562ab55adaa9dec25bb 
+Last-Update: 2019-04-08
+--- a/src/modules/partition/gui/PartitionPage.cpp
++++ b/src/modules/partition/gui/PartitionPage.cpp
+@@ -581,7 +581,7 @@ void
+ PartitionPage::onPartitionModelReset()
+ {
+     m_ui->partitionTreeView->expandAll();
+-    // updateButtons();
++    updateButtons();
+     updateBootLoaderIndex();
+ }
+