innobase_init(): Remove an unnecessary condition

Because innodb_file_per_table can be enabled at runtime after it
was disabled at startup, it is better to always register the same
innobase_hton->tablefile_extensions. Besides,
innodb_file_per_table=OFF does not prevent loading tables that may
have been created earlier with the .ibd file extension.

storage/innobase/handler/ha_innodb.cc

@@ -3810,10 +3810,7 @@ innobase_init(
         innobase_hton->fake_trx_id=wsrep_fake_trx_id;
 #endif /* WITH_WSREP */
 
-        if (srv_file_per_table) {
-		innobase_hton->tablefile_extensions = ha_innobase_exts;
-	}
-
+	innobase_hton->tablefile_extensions = ha_innobase_exts;
 	innobase_hton->table_options = innodb_table_option_list;
 
 	innodb_remember_check_sysvar_funcs();