fix(cursor): check for session presence independently

The current check for sessiosn will not be executed if `promoteLongs`
is present. It should check explicitly, outside of the branch.

Author: mbroadst

lib/sdam/cursor.js

@@ -91,13 +91,15 @@ class Cursor {
       transforms: options.transforms
     };
 
+    if (typeof options.session === 'object') {
+      this.s.session = options.session;
+    }
+
     // Add promoteLong to cursor state
     if (typeof topologyOptions.promoteLongs === 'boolean') {
       this.s.promoteLongs = topologyOptions.promoteLongs;
     } else if (typeof options.promoteLongs === 'boolean') {
       this.s.promoteLongs = options.promoteLongs;
-    } else if (typeof options.session === 'object') {
-      this.s.session = options.session;
     }
 
     // Add promoteValues to cursor state