Opraven binding formuláře vyúčtování služební cesty.

closes #231

src/main/webapp/main/trips/tripBillInterior.zul

@@ -341,13 +341,13 @@
 					<vbox hflex="max">
 						<textbox
 							inplace="true"
-							value="@load(each.to)"
+							value="@bind(each.to)"
 							maxlength="@load(vm.lengthText)"
 							sclass="grid-textbox-max-left"
 							readonly="@load(vm.billDisabled or disabled)" />
 						<textbox
 							inplace="true"
-							value="@load(each.back)"
+							value="@bind(each.back)"
 							maxlength="@load(vm.lengthText)"
 							sclass="grid-textbox-max-left"
 							readonly="@load(vm.billDisabled or disabled)" />