Added sql to the uninstall sql to remove changes made to the assets table on uninstall of a component. resolved gh-616

admin/compiler/joomla_3/install.mysql.utf8.sql

@@ -1,11 +1 @@
 ###INSTALL###
-
---
--- Always insure this column rules is large enough for all the access control values.
---
-ALTER TABLE `#__assets` CHANGE `rules` `rules` MEDIUMTEXT NOT NULL COMMENT 'JSON encoded access control.';
-
---
--- Always insure this column name is large enough for long component and view names.
---
-ALTER TABLE `#__assets` CHANGE `name` `name` VARCHAR(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT 'The unique name for the asset.';

admin/compiler/joomla_3/uninstall.mysql.utf8.sql

@@ -1 +1 @@
-###UNINSTALL###
+###UNINSTALL###