Remove theme property from container object (#1040)

Author: tylersticka

.changeset/polite-rings-taste.md

@@ -0,0 +1,5 @@
+---
+'@cloudfour/patterns': patch
+---
+
+Remove unnecessary theme prop from container which would conflict with Timber/WordPress prop of same name

src/objects/container/container.twig

@@ -1,4 +1,4 @@
-<div class="o-container{% if class %} {{class}}{% endif %}{% if theme %} t-{{theme}}{% endif %}">
+<div class="o-container{% if class %} {{class}}{% endif %}">
   <div class="o-container__content{% if content_class %} {{content_class}}{% endif %}">
     {% block content %}{% endblock %}
   </div>