Update postgres_schemadump to work correctly against a session after …

…login logic change

modules/auxiliary/scanner/postgres/postgres_schemadump.rb

@@ -28,7 +28,11 @@ def initialize
   end
 
   def run_host(_ip)
-    print_status 'When targeting a session, only the current database can be dumped.' if session
+    if session
+      print_status 'When targeting a session, only the current database can be dumped.'
+      self.postgres_conn = session.client
+    end
+
     pg_schema = get_schema
     pg_schema.each do |db|
       report_note(
@@ -70,7 +74,7 @@ def get_schema
       tmp_db = {}
       tmp_db['DBName'] = database_name
       tmp_db['Tables'] = []
-      postgres_login({ database: database_name })
+      postgres_login({ database: database_name }) unless session
       tmp_tblnames = smart_query("SELECT c.relname, n.nspname FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE n.nspname NOT IN ('pg_catalog','pg_toast') AND pg_catalog.pg_table_is_visible(c.oid);")
       if tmp_tblnames && !tmp_tblnames.empty?
         tmp_tblnames.each do |tbl_row|