blender: Fetch camera based on selected camera name

It was hardcoded to get the one called 'Camera', which won't work when
the selected camera is not that, or one doesn't exist with that name.

bindings/blender_init.py

@@ -369,7 +369,7 @@ def view_draw(self, context, depsgraph):
 			self.tag_update()
 		new_dims = (context.region.width, context.region.height)
 		if not self.old_dims or self.old_dims != new_dims:
-			cr_cam = self.cr_scene.cameras['Camera']
+			cr_cam = self.cr_scene.cameras[context.scene.camera.name]
 			cr_cam.opts.res_x = context.region.width
 			cr_cam.opts.res_y = context.region.height
 			self.cr_renderer.restart()
@@ -429,7 +429,11 @@ def view_update(self, context, depsgraph):
 		self.cr_renderer.prefs.bounces = depsgraph.scene.c_ray.bounces
 		self.cr_renderer.prefs.node_list = depsgraph.scene.c_ray.node_list
 		self.cr_renderer.prefs.is_iterative = 1
-		cr_cam = self.cr_scene.cameras['Camera']
+
+		# For reasons I can't fathom, depsgraph.updates doesn't let us know if the
+		# viewport camera changed, so we'll just assume that it did and fetch the whole
+		# thing manually instead.
+		cr_cam = self.cr_scene.cameras[context.scene.camera.name]
 		mtx = context.region_data.view_matrix.inverted()
 		euler = mtx.to_euler('XYZ')
 		loc = mtx.to_translation()