move cas fixture to own file

note_kfet/fixtures/cas.json

+[
+    {
+        "model": "cas_server.servicepattern",
+        "pk": 1,
+        "fields": {
+            "pos": 1,
+            "pattern": ".*",
+            "name": "REPLACEME"
+        }
+    }
+]

note_kfet/fixtures/initial.json

@@ -6,14 +6,5 @@
             "domain": "localhost",
             "name": "La Note Kfet \ud83c\udf7b"
         }
-    },
-    {
-        "model": "cas_server.servicepattern",
-        "pk": 1,
-        "fields": {
-            "pos": 1,
-            "pattern": ".*",
-            "name": "REPLACEME"
-        }
     }
-]
\ No newline at end of file
+]