helper: raise WaitDelay during tests

Helper runs very slowly with race detector. This prevents it from timing out.

Signed-off-by: Ophestra <cat@gensokyo.uk>

helper/bwrap_test.go

@@ -113,7 +113,7 @@ func TestBwrap(t *testing.T) {
 				nil,
 				sc, nil,
 			)
-		}, "exec")
+		})
 	})
 }