Bug 4920 - neworderempty.tmpl shouldn't call calcNeworderTotal() onload

Bug 4920 - neworderempty.tmpl shouldn't call calcNeworderTotal() onload

Currently, modifying existing orders will recalculate values if exchange rate
has changed, which destroys previous data (our use case is just to modify
Planning value fields).

Since fields also have onChange event which also triggers caclNeworderTotal,
onload event seems redundant.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>