Fix device startup

Author: marcelldls

src/fastcs/backends/tango/dsr.py

@@ -16,7 +16,6 @@
 @dataclass
 class TangoDSROptions:
     dev_name: str = "MY/DEVICE/NAME"
-    dev_class: str = "FAST_CS_DEVICE"
     dsr_instance: str = "MY_SERVER_INSTANCE"
     debug: bool = False
 
@@ -178,8 +177,8 @@ def run(self, options: TangoDSROptions | None = None) -> None:
         dsr_args = _collect_dsr_args(options)
 
         server.run(
-            (self.dev_class,),
-            [options.dev_class, options.dsr_instance, *dsr_args],
+            (self._device,),
+            [self.dev_class, options.dsr_instance, *dsr_args],
             green_mode=server.GreenMode.Asyncio,
         )