go.talks/present: fix build
EnableInlining looks like a precursor to a change that didn't get finished.

R=golang-dev, campoy
CC=golang-dev
https://golang.org/cl/6822114
diff --git a/present/image.go b/present/image.go
index 9202ee4..5c5ea5c 100644
--- a/present/image.go
+++ b/present/image.go
@@ -15,7 +15,6 @@
 }
 
 type Image struct {
-	EnableInlining
 	File string
 	Args []interface{}
 }