fixing an if statement

Author: Rudy Alkarem

famodel/project.py

@@ -4963,7 +4963,7 @@ def extractFarmInfo(self, cmax=5, fmax=10/6, Cmeander=1.9, force=1e9, direction=
             i += 1
 
         # Return to original status if requested
-        if retainForce:
+        if not retainForce:
             for _, pf in self.platformList.items():   
                 pf.body.f6Ext = np.array([0, 0, 0, 0, 0, 0])