[FIX] Brightness adjustment

Ensure current brightness value is used in calculations, not the previous one
Ensure holding volume buttons continues to change volume, even if data hasn't been refreshed from remove

screens.py

@@ -182,12 +182,16 @@ class LightsScreen(Screen):
                 toggleLight(self.es[i]["id"])
                 a = True
             # if up/down clicked, adjust brightness for all lights that are turned on
-            pcfg = i in self.prev and "on" in self.prev[i] and self.prev[i]["on"] and "brightness" in self.prev[i]
+            pcfg = i in self.d and "on" in self.d[i] and self.d[i]["on"] and "brightness" in self.d[i]
             if (up and pcfg):
-                setBrightness(self.es[i]["id"], min(255, self.prev[i]["brightness"] + 35))
+                v = min(255, self.d[i]["brightness"] + 35)
+                setBrightness(self.es[i]["id"], v)
+                self.d[i]["brightness"] = v
                 a = True
             elif (down and pcfg):
-                setBrightness(self.es[i]["id"], max(1, self.prev[i]["brightness"] - 35))
+                v = max(1, self.d[i]["brightness"] - 35)
+                setBrightness(self.es[i]["id"], v)
+                self.d[i]["brightness"] = v                
                 a = True
         return a