fix: remove duplicate <install> block from component manifest

The second <install> block referenced admin/sql/install.mysql.sql
which resolved to a non-existent path during Joomla package updates,
causing "Install path does not exist" error.

Claude-Session: https://claude.ai/code/session_01Jo2JpjCwfHAh2HHRSjczKq

source/packages/com_mokosuiteclient/mokosuiteclient.xml

@@ -74,10 +74,6 @@
 		<folder>tmpl</folder>
 	</files>
 
-	<install>
-		<sql><file driver="mysql" charset="utf8">admin/sql/install.mysql.sql</file></sql>
-	</install>
-
 	<api>
 		<files folder="api">
 			<folder>src</folder>