Add monarch.com and monarchmoney.com to shared credentials (#966)

They're the same entity. Based on an email communication from the service, I can see that monarchmoney.com is being
phased out, but is still active at this time. Thus, a shared group.

Author: rmondello

quirks/shared-credentials.json

@@ -488,6 +488,12 @@
         ],
         "fromDomainsAreObsoleted": true
     },
+    {
+        "shared": [
+            "monarch.com",
+            "monarchmoney.com"
+        ]
+    },
     {
         "from": [
             "moneybird.nl",