add icon for dark mode

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/usersettings/Appearance.kt

@@ -633,7 +633,7 @@ object AppearanceScope {
       verticalArrangement = Arrangement.Center,
       horizontalAlignment = Alignment.CenterHorizontally
     ) {
-      Icon(painterResource(MR.images.ic_light_mode), stringResource(MR.strings.color_mode_light), tint = MenuTextColor)
+      Icon(painterResource(if (themeMode == DefaultThemeMode.LIGHT) MR.images.ic_light_mode else MR.images.ic_dark_mode), stringResource(MR.strings.color_mode_light), tint = MenuTextColor)
     }
   }
 

apps/multiplatform/common/src/commonMain/resources/MR/images/ic_dark_mode.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 -960 960 960" width="24px"><path d="M480-121.5q-149.5 0-254-104.5T121.5-480q0-133 78.75-227.5T406-829q21-4.5 35.25-1T463-815.75q7 10.25 6 26t-9.5 37.25q-8 22.5-12.25 45.53Q443-683.93 443-660q0 90.42 63.29 153.71Q569.58-443 660-443q24 0 46.25-3.75t44.25-10.75q24-9 40.75-8.5t26.75 8q9.5 8 12.25 22.96Q833-420.09 828-398q-28 118.5-121.6 197.5t-226.4 79Zm.16-57.5q108.84 0 190.59-68.25T773-408q-25.83 10.95-54.92 16.73-29.08 5.77-57.99 5.77-114.41 0-194.5-80.09t-80.09-194.5q0-23.91 5.02-51.99Q395.55-740.17 409-776q-99.5 27.5-164.75 110.51Q179-582.47 179-479.83q0 125.37 87.84 213.1Q354.68-179 480.16-179Zm-3.66-298.5Z"/></svg>