fix: remove unused dark mode color

app/src/main/res/values-night/colors.xml

@@ -6,7 +6,6 @@
     <color name="colorMsg">#212121</color>
     <color name="colorMyMsg">#28463C</color>
     <color name="colorAdvancedBackground">#141414</color>
-    <color name="colorIconTint">#FFFFFF</color>
     <color name="colorMenuItem">#FFFFFF</color>
     <color name="selectedColor">#67EA94</color>
     <color name="unselectedColor">#AAAAAA</color>