hosts table: fix locator for host Name column (again)

Re-introducing this fix after being reverted.
This commit unintentionally broke navigation to host details page,
which was caused by another issue in the Sat hosts table,
then fixed in 71a745e

Original description:

The `HostsView` Name table column XPath was missing leading '.' character,
which caused that all host rows returned had the same Name value,
equal to the first table row host Name.

airgun/views/host.py

@@ -228,7 +228,7 @@ class HostsView(BaseLoggedInView, SearchableViewMixinPF4):
         column_widgets={
             0: Checkbox(locator=".//input[@class='host_select_boxes']"),
             'Name': Text(
-                "//a[contains(@href, '/new/hosts/') and not(contains(@href, 'Insights'))]"
+                ".//a[contains(@href, '/new/hosts/') and not(contains(@href, 'Insights'))]"
             ),
             'Recommendations': Text("./a"),
             'Actions': ActionsDropdown("./div[contains(@class, 'btn-group')]"),