Fix spread snapshot test (#1119)

See https://github.com/prettier/prettier/pull/1064#discussion_r109787248

tests/flow_type_spread/__snapshots__/jsfmt.spec.js.snap

@@ -6,10 +6,3 @@ exports[`spread.js 1`] = `
 type TypeB = { ...TypeA };
 "
 `;
-
-exports[`spread.js 2`] = `
-"type TypeB = { ...TypeA };
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-type TypeB = { ...TypeA };
-"
-`;

tests/flow_type_spread/jsfmt.spec.js

@@ -1,2 +1 @@
-run_spec(__dirname);
-run_spec(__dirname, {parser: 'flow'});
+run_spec(__dirname, null, ["babylon"]);