Bump HDDSIZEGB for more GNOME and KDE products

We have it at 20G for Workstation live, but not for KDE live or
for the update Workstation or KDE products. We just hit an issue
today where anaconda thinks 10G isn't enough space for a KDE
live install after a grub2 update (which I think only bumped
the required space veeery slightly, but enough to throw anaconda
over the limit). Let's just go up to 15G for all GNOME and KDE
cases where we're not at 20G.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

templates-updates.fif.json

@@ -85,6 +85,7 @@
             "flavor": "updates-workstation-live-iso",
             "settings": {
                 "DESKTOP": "gnome",
+                "HDDSIZEGB": "15",
                 "LIVE": "1",
                 "PACKAGE_SET": "default"
             },
@@ -96,6 +97,7 @@
 	    "flavor": "updates-kde-live-iso",
             "settings": {
                 "DESKTOP": "kde",
+                "HDDSIZEGB": "15",
                 "LIVE": "1",
                 "PACKAGE_SET": "default"
             },

templates.fif.json

@@ -197,6 +197,7 @@
             "settings": {
                 "DEPLOY_UPLOAD_TEST": "install_default_upload",
                 "DESKTOP": "kde",
+                "HDDSIZEGB": "15",
                 "LIVE": "1",
                 "PACKAGE_SET": "default",
                 "TEST_TARGET": "ISO"