Remove span to regain explicit whitespace for country options

This change restores whitespace between the country name and prefix code in the
country dropdown.

src/components/views/auth/CountryDropdown.js

@@ -113,7 +113,7 @@ export default class CountryDropdown extends React.Component {
         const options = displayedCountries.map((country) => {
             return <div className="mx_CountryDropdown_option" key={country.iso2}>
                 { this._flagImgForIso2(country.iso2) }
-                { country.name } <span>(+{ country.prefix })</span>
+                { country.name } (+{ country.prefix })
             </div>;
         });