Avoid inline styles inside <code> / <pre> conversion (#117)

* Avoid inline styles inside `<code>` / `<pre>` conversion

The check used for this is analogous to that used to avoid escaping
potential markup characters inside such tags.

Fixes #103

---------

Co-authored-by: AlexVonB <AlexVonB@users.noreply.github.com>

markdownify/__init__.py

@@ -48,6 +48,8 @@ def abstract_inline_conversion(markup_fn):
     """
     def implementation(self, el, text, convert_as_inline):
         markup = markup_fn(self)
+        if el.find_parent(['pre', 'code', 'kbd', 'samp']):
+            return text
         prefix, suffix, text = chomp(text)
         if not text:
             return ''