fix(server): incorrect list condition (#13005)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Improved session filtering to use the correct criteria when querying
sessions, ensuring more accurate results based on the action parameter.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/__tests__/models/__snapshots__/copilot-session.spec.ts.md

@@ -368,7 +368,7 @@ Generated by [AVA](https://avajs.dev).
         ],
       },
       non_action_sessions: {
-        count: 5,
+        count: 4,
         sessionTypes: [
           {
             hasMessages: false,
@@ -391,13 +391,6 @@ Generated by [AVA](https://avajs.dev).
             messageCount: 0,
             type: 'doc',
           },
-          {
-            hasMessages: false,
-            isAction: true,
-            isFork: false,
-            messageCount: 0,
-            type: 'doc',
-          },
           {
             hasMessages: false,
             isAction: false,
@@ -408,7 +401,7 @@ Generated by [AVA](https://avajs.dev).
         ],
       },
       non_fork_sessions: {
-        count: 3,
+        count: 4,
         sessionTypes: [
           {
             hasMessages: false,
@@ -424,6 +417,13 @@ Generated by [AVA](https://avajs.dev).
             messageCount: 0,
             type: 'doc',
           },
+          {
+            hasMessages: false,
+            isAction: true,
+            isFork: false,
+            messageCount: 0,
+            type: 'doc',
+          },
           {
             hasMessages: false,
             isAction: false,