[FIX] mail,crm: fix automatic notification emails

They need to have the message_type 'email' instead of 'notification', so
they can be starred in the interface.

addons/crm/crm_data.xml

@@ -30,7 +30,7 @@
         <record model="mail.message" id="module_install_notification">
             <field name="model">mail.channel</field>
             <field name="res_id" ref="mail.channel_all_employees"/>
-            <field name="message_type">notification</field>
+            <field name="message_type">email</field>
             <field name="subtype_id" ref="mail.mt_comment"/>
             <field name="subject">CRM application installed!</field>
             <field name="body"><![CDATA[<p>From the top Sales menu you can track leads and opportunities, get accurate forecast on your sales pipeline, plan meetings, get realtime statistics and efficiently organize the communication with your prospects.</p>

addons/mail/data/mail_channel_data.xml

@@ -12,7 +12,7 @@
         <record model="mail.message" id="module_install_notification" context="{'mail_notify_noemail': True}">
             <field name="model">mail.channel</field>
             <field name="res_id" ref="mail.channel_all_employees"/>
-            <field name="message_type">notification</field>
+            <field name="message_type">email</field>
             <field name="subtype_id" ref="mail.mt_comment"/>
             <field name="subject">Welcome to Odoo!</field>
             <field name="body"><![CDATA[<p>Your homepage is a summary of messages you received and key information about documents you follow.</p>