fix theme

apps/nspanel-lovelace-ui/luibackend/theme.py

@@ -7,16 +7,11 @@ default_screensaver_color_mapping = {
     "time":             "65535",
     "timeAMPM":         "65535",
     "date":             "65535",
-    "tMainIcon":        "65535",
     "tMainText":        "65535",
     "tForecast1":       "65535",
     "tForecast2":       "65535",
     "tForecast3":       "65535",
     "tForecast4":       "65535",
-    "tF1Icon":          "65535",
-    "tF2Icon":          "65535",
-    "tF3Icon":          "65535",
-    "tF4Icon":          "65535",
     "tForecast1Val":    "65535",
     "tForecast2Val":    "65535",
     "tForecast3Val":    "65535",