Switch dice RNG

Author: mark9064

src/displayapp/screens/Dice.h

@@ -29,7 +29,7 @@ namespace Pinetime {
         lv_task_t* refreshTask;
         bool enableShakeForDice = false;
 
-        std::mt19937 gen;
+        std::minstd_rand gen;
 
         std::array<lv_color_t, 3> resultColors = {LV_COLOR_YELLOW, LV_COLOR_MAGENTA, LV_COLOR_AQUA};
         uint8_t currentColorIndex;