exthost: fix selection not serializing correctly

Author: connor4312

src/vs/editor/common/core/range.ts

@@ -466,11 +466,6 @@ export class Range {
 	}
 
 	public toJSON(): IRange {
-		return {
-			endColumn: this.endColumn,
-			endLineNumber: this.endLineNumber,
-			startColumn: this.startColumn,
-			startLineNumber: this.startLineNumber
-		};
+		return this;
 	}
 }