Remove the code that removed paragraph tags from markdown -> html.

This fixes #2, but reverts mujx#438.  I do not think mujx#438 was a
valid issue, as it complained about the display of valid HTML on riot,
which speaks more to how Riot styles things than about an issue in
nheko itself.

src/Utils.cpp

@@ -365,10 +365,6 @@ utils::markdownToHtml(const QString &text)
 
         auto result = QString::fromStdString(html).trimmed();
 
-        // Strip paragraph tags.
-        result.replace("<p>", "");
-        result.replace("</p>", "");
-
         return result;
 }