The `CanvasBox.positionChanged` signal expects to receive `x` and `y` as
`int`s, but they were being passed as `float`s, which mangled them on
the receiving signal handler.
This manifested as huge `x` and `y` values for canvas boxes, and when
saving and loading projects all boxes would hit the edge of the canvas
and get placed at the extreme edge.
Fixes this error, which would occur after `setPrecision` had been called
with a non-integer value.
```
Traceback (most recent call last):
File "/usr/share/carla/carla_host.py", line 1442, in slot_handlePluginAddedCallback
pitem = self.ui.listWidget.createItem(pluginId, self.fSavedSettings[CARLA_KEY_MAIN_CLASSIC_SKIN])
File "/usr/share/carla/widgets/racklistwidget.py", line 241, in createItem
return RackListItem(self, pluginId, useClassicSkin)
File "/usr/share/carla/widgets/racklistwidget.py", line 86, in __init__
self.recreateWidget(firstInit = True)
File "/usr/share/carla/widgets/racklistwidget.py", line 176, in recreateWidget
self.fWidget = createPluginSlot(self.fParent, self.host, self.fPluginId, self.fOptions)
File "/usr/share/carla/carla_skin.py", line 2090, in createPluginSlot
return PluginSlot_Default(parent, host, pluginId, skinColor, skinStyle)
File "/usr/share/carla/carla_skin.py", line 1766, in __init__
self.ready()
File "/usr/share/carla/carla_skin.py", line 642, in ready
paramWidget.setValue(self.host.get_internal_parameter_value(self.fPluginId, paramIndex))
File "/usr/share/carla/widgets/scalabledial.py", line 282, in setValue
QDial.setValue(self, qtValue)
TypeError: setValue(self, int): argument 2 has unexpected type 'float'
Error mapping plugin to canvas client: 16 Step Sequencer
```