Removed bad e_LEGACY_MODE implementation

e_LEGACY_MODE caused the query results from e_db_pdo and e_db_mysql to return different styles (MYSQL_BOTH and MYSQL_ASSOC, respectively).

To resolve this inconsistency, e_LEGACY_MODE has been removed from the e107 core.

e107_tests/tests/unit/e107pluginTest.php

@@ -405,7 +405,7 @@
 				unset($actual[$unimportant_key]);
 			}
 
-			// Filter out cruft from e_LEGACY_MODE database output
+			// Filter out cruft from MYSQL_BOTH database output
 			foreach ($actual as $key => $value)
 			{
 				if (is_int($key)) unset($actual[$key]);