fix: addition of an image to a series was failing on PostgreSQL.

The error was:
org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad SQL grammar [UPDATE
series s SET s.updated_at = ? , s.updated_by = ? WHERE s.id = ?]; nested exception is
org.postgresql.util.PSQLException: ERROR: column "s" of relation "series" does not exist

Part of #1140

Author: php-coder

src/main/resources/sql/series_dao_queries.properties

@@ -42,10 +42,10 @@ VALUES \
      )
 
 series.mark_as_modified = \
-UPDATE series s \
-   SET s.updated_at = :updated_at \
-     , s.updated_by = :updated_by \
- WHERE s.id = :series_id
+UPDATE series \
+   SET updated_at = :updated_at \
+     , updated_by = :updated_by \
+ WHERE id = :series_id
 
 series.find_all_for_sitemap = \
 SELECT s.id, s.updated_at \