Revision 1879198

Fix invalid escape sequence in working copy queries which causes
upgrades from Subversion 1.7 working copies to fail with recent
SQLite versions (>= 3.29.0).

References:
- https://www.sqlite.org/faq.html#q24
- https://www.sqlite.org/lang_keywords.html

* subversion/libsvn_wc/wc-metadata.sql
  (STMT_UPGRADE_TO_30): Use '' to delimit values and "" to escape column names.