nxos_system test fix inventory_hostname_short (#36359)

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

test/integration/targets/nxos_system/tests/common/set_hostname.yaml

@@ -6,7 +6,7 @@
 - block:
   - name: setup
     nxos_config:
-      lines: "hostname {{ inventory_hostname }}"
+      lines: "hostname {{ inventory_hostname_short }}"
       match: none
       provider: "{{ connection }}"
 
@@ -33,7 +33,7 @@
   always:
   - name: teardown
     nxos_config:
-      lines: "hostname {{ inventory_hostname }}"
+      lines: "hostname {{ inventory_hostname_short }}"
       match: none
       provider: "{{ connection }}"