fixed local scoping on call tag.

tests/testfor.jet

@@ -2,8 +2,6 @@
 <jet cgi="true" name1="localname" filterblanklines="true" trimlines="true">
  <set name="iz" value="8" scope="local" />
  <for name="ix" start="1" end="10" step="1" scope="local" iz="#[iz]">
-  #[scope]
-  <dump file="dump.txt" />
-  -->[iz]-[iy]-#[ix]<--
+  -->#[ix]<--
  </for>
 </jet>