Add navigation bar padding to `SleepTimer` on `MainScreen`

app/src/main/kotlin/com/simplemobiletools/flashlight/screens/MainScreen.kt

@@ -87,7 +87,8 @@ internal fun MainScreen(
         }
 
         Box(
-            modifier = Modifier.align(Alignment.BottomEnd),
+            modifier = Modifier.align(Alignment.BottomEnd)
+                .navigationBarsPadding(),
         ) {
             sleepTimer()
         }