tdf#124448: Don't show the 'Download as' menu entry on mobile apps

It doesn't make sense, and the functionality doesn't do anything
anyway.

Change-Id: I61dfeb8815064756af5779e761272c22339f2de5
diff --git a/loleaflet/src/control/Control.Menubar.js b/loleaflet/src/control/Control.Menubar.js
index abd75b0..d0e8c57 100644
--- a/loleaflet/src/control/Control.Menubar.js
+++ b/loleaflet/src/control/Control.Menubar.js
@@ -21,7 +21,7 @@
				{name: _('Share...'), id:'shareas', type: 'action'},
				{name: _UNO('.uno:Print', 'text'), id: 'print', type: 'action'},
				{name: _('See revision history'), id: 'rev-history', type: 'action'},
				{name: _('Download as'), id: 'downloadas', type: 'menu', menu: [
				{name: _('Download as'), id: 'downloadas', type: 'menu', mobileapp: false, menu: [
					{name: _('PDF Document (.pdf)'), id: 'downloadas-pdf', type: 'action'},
					{name: _('ODF text document (.odt)'), id: 'downloadas-odt', type: 'action'},
					{name: _('Word 2003 Document (.doc)'), id: 'downloadas-doc', type: 'action'},
@@ -238,7 +238,7 @@
				{name: _('Share...'), id:'shareas', type: 'action'},
				{name: _UNO('.uno:Print', 'presentation'), id: 'print', type: 'action'},
				{name: _('See revision history'), id: 'rev-history', type: 'action'},
				{name: _('Download as'), id: 'downloadas', type: 'menu', menu: [
				{name: _('Download as'), id: 'downloadas', type: 'menu', mobileapp: false, menu: [
					{name: _('PDF Document (.pdf)'), id: 'downloadas-pdf', type: 'action'},
					{name: _('ODF presentation (.odp)'), id: 'downloadas-odp', type: 'action'},
					{name: _('PowerPoint 2003 Presentation (.ppt)'), id: 'downloadas-ppt', type: 'action'},
@@ -326,7 +326,7 @@
				{name: _('Share...'), id:'shareas', type: 'action'},
				{name: _UNO('.uno:Print', 'spreadsheet'), id: 'print', type: 'action'},
				{name: _('See revision history'), id: 'rev-history', type: 'action'},
				{name: _('Download as'), id:'downloadas', type: 'menu', menu: [
				{name: _('Download as'), id:'downloadas', type: 'menu', mobileapp: false, menu: [
					{name: _('PDF Document (.pdf)'), id: 'downloadas-pdf', type: 'action'},
					{name: _('ODF spreadsheet (.ods)'), id: 'downloadas-ods', type: 'action'},
					{name: _('Excel 2003 Spreadsheet (.xls)'), id: 'downloadas-xls', type: 'action'},