Revert "[stable-2.8] hostname - fix Oracle Linux (#58510)"

This reverts commit dd304b4811.

Only affects 2.9+ as it is introduced by bundling a new version of
distro

changelogs/fragments/hostname-oracle-linux-regeression.yaml

@@ -1,2 +0,0 @@
-bugfixes:
-  - hostname - fix regression with Oracle Linux (https://github.com/ansible/ansible/issues/42726)

lib/ansible/modules/system/hostname.py

@@ -639,7 +639,7 @@ class ScientificHostname(Hostname):
 
 class OracleLinuxHostname(Hostname):
     platform = 'Linux'
-    distribution = 'Oracle'
+    distribution = 'Ol'
     strategy_class = RedHatStrategy