fix regex parse for total memory in slxos_facts.py (#43258)

* fix regex parse for total memory in slxos_facts.py

* account for one or no spaces per LindsayHill's suggestion

lib/ansible/modules/network/slxos/slxos_facts.py

@@ -208,7 +208,7 @@ class Hardware(FactsBase):
             self.facts['memfree_mb'] = int(round(int(self.parse_memfree(data)) / 1024, 0))
 
     def parse_memtotal(self, data):
-        match = re.search(r'TotalMemory: (\d+)\s', data, re.M)
+        match = re.search(r'Total\s*Memory: (\d+)\s', data, re.M)
         if match:
             return match.group(1)