single-line if statement parsed wrong

This test fails. The aa.value = 8 code turns into its own statement, and the else branch is empty. I don't think this happens in brs, so this is something we introduced in the brighterscript parser.

 it('supports single-line if-else', () => {
        let { tokens } = Lexer.scan(`
            if foo > 5 then aa.value = ">5" else aa.value = 8
        `);
        let { statements, diagnostics } = Parser.parse(tokens);
        expect(diagnostics).to.be.lengthOf(0);
        let statement = statements[0] as IfStatement;
        expect(statement).to.be.instanceof(IfStatement);
        expect(statement.elseBranch).to.exist;
    });

Start with the single-line if-else example and trace the tokens from Lexer.scan into Parser.parse. Confirm the parsed result is an IfStatement with an existing elseBranch, no diagnostics, and both assignment statements in their respective branches.