Also fix the case where we are to the right of a spread expr

tests/cases/fourslash/tsxCompletion7.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+//@Filename: file.tsx
+//// declare module JSX {
+////     interface Element { }
+////     interface IntrinsicElements {
+////         div: { ONE: string; TWO: number; }
+////     }
+//// }
+//// let y = { ONE: '' };
+//// var x = <div {...y} /**/ />;
+
+goTo.marker();
+
+verify.completionListContains("ONE");
+verify.completionListContains("TWO");
+verify.not.completionListAllowsNewIdentifier();