Fixed backref import (#8057)

Author: facelessuser

material/plugins/search/plugin.py

@@ -22,7 +22,7 @@
 import logging
 import os
 import re
-import backrefs as bre
+from backrefs import bre
 
 from html import escape
 from html.parser import HTMLParser

src/plugins/search/plugin.py

@@ -22,7 +22,7 @@
 import logging
 import os
 import re
-import backrefs as bre
+from backrefs import bre
 
 from html import escape
 from html.parser import HTMLParser