controlsd: ScreenDisplayMode init uses put_int, not put_bool

Every other reference treats ScreenDisplayMode as an int (range 0-4).
The init line was using put_bool(0) which happened to write the same
"0" string and read back fine via get_int, but the type mismatch was
misleading.

selfdrive/controls/controlsd.py

@@ -77,7 +77,7 @@ class Controls:
     self.params_storage = Params("/persist/params")
 
     self.params_memory.put_bool("CPTLkasButtonAction", False)
-    self.params_memory.put_bool("ScreenDisplayMode", 0)
+    self.params_memory.put_int("ScreenDisplayMode", 0)
 
     self.radarless_model = self.params.get("Model", encoding='utf-8') in RADARLESS_MODELS