Removed extra '.' in plain/sql dumps

Removed an extra '.' in file names introduced by the pg_dump options
patch, resulting in names like db..sql or db..sql.gz instead of just
db.sql or db.sql.gz.

handlers/pgsql.in

@@ -170,7 +170,7 @@ else
       fi
    fi
    for db in $databases; do
-      dumpext=".sql"
+      dumpext="sql"
       if [ "$format" != "plain" ]; then
          dumpext="pg_dump"
       fi