XAFORUM-118 : Remove custom styling for buttons

* Removed custom styling for New Topic and New answer buttons.
XAFORUM-118 : Remove custom styling for buttons

* Removed custom styling for buttons from permalink modal box.
XAFORUM-118 : Remove custom styling for buttons

* Removed custom styling for 'Show 10 more' button, when there are more than 10 topics.
Merge branch 'gabrielasmeria-118'