fix typo in get_uec_image.sh

it's precise, not percise.

Fixes bug #1085233

Change-Id: I857c233c9b461b7cc6e2ac356aa6f2cd6be93ff5

Author: Sean Dague

tools/get_uec_image.sh

@@ -65,7 +65,7 @@ KERNEL=$3
 
 case $DIST_NAME in
     quantal)    ;;
-    percise)    ;;
+    precise)    ;;
     oneiric)    ;;
     natty)      ;;
     maverick)   ;;