Fix ipxe in manifest

Change-Id: I51bc340800e4ecfce95aa4ac8c74864990d79a43
diff --git a/default.xml b/default.xml
index 0fe4122..b508727 100644
--- a/default.xml
+++ b/default.xml
@@ -42,6 +42,6 @@
   <!-- Tooling -->
   <project path="tools/cggs" name="cggs"/>
   <project path="tools/sjsg" name="sjsg"/>
-  <project path="tools/ixpe-build" name="ipxe-build"/>
+  <project path="tools/ipxe-build" name="ipxe-build"/>
 
 </manifest>