Fix a bug in the permutations.test script.

FossilOrigin-Name: 3b20ad03be55613d922d81aec5313327bf4098b9
diff --git a/test/tester.tcl b/test/tester.tcl
index 6d0f6ab..906f69e 100644
--- a/test/tester.tcl
+++ b/test/tester.tcl
@@ -308,8 +308,8 @@
   }
   if {!$go} return
 
-  if {[info exists ::G(perm:name)]} {
-    set name "$::G(perm:name)$name"
+  if {[info exists ::G(perm:prefix)]} {
+    set name "$::G(perm:prefix)$name"
   }
 
   incr_ntest