Fix heap_profile with enabled packages list

Change-Id: I93af5fbbf762a08bf4b450b03f9873a1b03a6b21
diff --git a/tools/heap_profile b/tools/heap_profile
index 72c0342..e1e7d72 100755
--- a/tools/heap_profile
+++ b/tools/heap_profile
@@ -70,11 +70,11 @@
   os.chmod(local_file, 0o755)
   return local_file
 
-PACKAGES_LIST_CFG='''data_sources {{
-  config {{
+PACKAGES_LIST_CFG='''data_sources {
+  config {
     name: "android.packages_list"
-  }}
-}}
+  }
+}
 '''