Multi Camera et al fail to remove tags added to physical cameras

[marktsuchida]

Related to #773.

Multi Camera (and ArduinoCounter, CameraPulser) add the tags CameraChannelIndex/Name (with device = the virtual camera label) to the physical cameras when they are set. But the corresponding call to RemoveTag doesn't actually remove those tags, because they don't include the device label.

For example, for Multi Camera:

mmCoreAndDevices/DeviceAdapters/Utilities/MultiCamera.cpp

Lines 635 to 636 in 11a9e5a

	camera->AddTag(MM::g_Keyword_CameraChannelName, myName, usedCameras_[i].c_str());
	camera->AddTag(MM::g_Keyword_CameraChannelIndex, myName, os.str().c_str());

mmCoreAndDevices/DeviceAdapters/Utilities/MultiCamera.cpp

Lines 617 to 618 in 11a9e5a

	camera->RemoveTag(MM::g_Keyword_CameraChannelName);
	camera->RemoveTag(MM::g_Keyword_CameraChannelIndex);