[FIX] base: show Qweb views from reports
[FIX] base: show Qweb views from reports

The commit 480184115d1855c434e57fae94cb1f8b197196e8 introduce a new 
report type (qweb-text). It uses qweb syntax and views but the button 
'Qweb view' is hidden in the report form. 
This commit displays the button for the new type.

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