cmd/cue/cmd: fix --dryrun flag description of import command

The '--dryrun' flag description is the same as '--force' flag and it's wrong.
Copy from `add` command's '--dryrun' flag description.

Change-Id: Ie3d77a2f2e2e45da9e513ded6636402fce276876
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3060
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/cmd/cue/cmd/import.go b/cmd/cue/cmd/import.go
index 54849d6..52df22e 100644
--- a/cmd/cue/cmd/import.go
+++ b/cmd/cue/cmd/import.go
@@ -200,7 +200,7 @@
 	cmd.Flags().StringP(string(flagGlob), "n", "", "glob filter for file names")
 	cmd.Flags().String(string(flagType), "", "only apply to files of this type")
 	cmd.Flags().BoolP(string(flagForce), "f", false, "force overwriting existing files")
-	cmd.Flags().Bool(string(flagDryrun), false, "force overwriting existing files")
+	cmd.Flags().Bool(string(flagDryrun), false, "only run simulation")
 
 	cmd.Flags().StringP(string(flagPath), "l", "", "path to include root")
 	cmd.Flags().Bool(string(flagList), false, "concatenate multiple objects into a list")