Fix the ocitools patten in .gitignore

Signed-off-by: Haiyan Meng <hmeng@redhat.com>

Author: Haiyan Meng

.gitignore

@@ -26,7 +26,7 @@ _testmain.go
 
 # Compiled binaries
 oci
-ocitools
+/ocitools
 /runtimetest
 
 *.1