[FIX] website: space symbol is missing when compress html is enabled

Issue: when the qWeb compress rendered HTML for a better Google PageSpeed
result, some text fields are missing spacebar between fa icons and text,
and between some fields.

addons/website/models/ir_qweb.py

@@ -45,5 +45,5 @@ class QWeb(orm.AbstractModel):
         compress = request and not request.debug and getattr(request, 'website', None) and request.website.compress_html
         if compress and element.getparent().tag not in self.PRESERVE_WHITESPACE:
             # No need to recurse because those tags children are not html5 parser friendly
-            tail = self.re_remove_spaces.sub(' ', tail.rstrip())
+            tail = self.re_remove_spaces.sub(' ', tail)
         return super(QWeb, self).render_tail(tail, element, qwebcontext)