qubes-release: install fedora-29 template by default

qubes-release/comps-qubes.xml

@@ -1398,7 +1398,7 @@
       <packagereq type="mandatory">qubes-gui-dom0</packagereq>
       <packagereq type="mandatory">qubes-desktop-linux-manager</packagereq>
       <packagereq type="mandatory">qubes-mgmt-salt-dom0</packagereq>
-      <packagereq type="mandatory">qubes-template-fedora-28</packagereq>
+      <packagereq type="mandatory">qubes-template-fedora-29</packagereq>
       <packagereq type="default">qubes-gpg-split-dom0</packagereq>
       <packagereq type="default">qubes-img-converter-dom0</packagereq>
       <packagereq type="default">qubes-input-proxy</packagereq>