don't add = as a delim

anki/importing/csvfile.py

@@ -90,7 +90,7 @@ class TextImporter(Importer):
                 info=_("File is not encoded in UTF-8."))
         self.dialect = None
         sniffer = csv.Sniffer()
-        delims = [',', '\t', ';', ':', '=']
+        delims = [',', '\t', ';', ':']
         if not self.delimiter:
             try:
                 self.dialect = sniffer.sniff("\n".join(self.data[:10]),