[FIX] website: backend html widget: only use an iframe if field is not readonly
[FIX] website: backend html widget: only use an iframe if field is not readonly

ygol/odoo,syci/OCB,tvtsoft/odoo8,laslabs/odoo,sysadminmatmoz/OCB,microcom/odoo,sysadminmatmoz/OCB,dfang/odoo,optima-ict/odoo,storm-computers/odoo,addition-it-solutions/project-all,Elico-Corp/odoo_OCB,stephen144/odoo,sysadminmatmoz/OCB,tvtsoft/odoo8,laslabs/odoo,alhashash/odoo,ygol/odoo,sysadminmatmoz/OCB,bplancher/odoo,microcom/odoo,dfang/odoo,hip-odoo/odoo,Grirrane/odoo,syci/OCB,ygol/odoo,optima-ict/odoo,optima-ict/odoo,dfang/odoo,Elico-Corp/odoo_OCB,mkieszek/odoo,alhashash/odoo,storm-computers/odoo,microcom/odoo,syci/OCB,laslabs/odoo,hip-odoo/odoo,ygol/odoo,laslabs/odoo,microcom/odoo,mkieszek/odoo,ygol/odoo,dfang/odoo,ygol/odoo,tvtsoft/odoo8,addition-it-solutions/project-all,stephen144/odoo,Grirrane/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,ygol/odoo,syci/OCB,Grirrane/odoo,bplancher/odoo,stephen144/odoo,tvtsoft/odoo8,addition-it-solutions/project-all,optima-ict/odoo,alhashash/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,optima-ict/odoo,tvtsoft/odoo8,dfang/odoo,hip-odoo/odoo,bplancher/odoo,storm-computers/odoo,dfang/odoo,storm-computers/odoo,bplancher/odoo,mkieszek/odoo,alhashash/odoo,Grirrane/odoo,syci/OCB,mkieszek/odoo,tvtsoft/odoo8,addition-it-solutions/project-all,optima-ict/odoo,Grirrane/odoo,alhashash/odoo,Elico-Corp/odoo_OCB,syci/OCB,Elico-Corp/odoo_OCB,hip-odoo/odoo,addition-it-solutions/project-all,addition-it-solutions/project-all,microcom/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,sysadminmatmoz/OCB,storm-computers/odoo,stephen144/odoo,laslabs/odoo,stephen144/odoo,alhashash/odoo,laslabs/odoo,stephen144/odoo,Grirrane/odoo,sysadminmatmoz/OCB,bplancher/odoo,hip-odoo/odoo,microcom/odoo,mkieszek/odoo,mkieszek/odoo