Reduce type warnings

Marlin/src/lcd/dogm/ultralcd_DOGM.cpp

@@ -162,12 +162,12 @@ void MarlinUI::set_font(const MarlinFont font_nr) {
     // Determine text space needed
     #ifndef STRING_SPLASH_LINE2
       constexpr uint8_t text_total_height = MENU_FONT_HEIGHT,
-                        text_width_1 = (sizeof(STRING_SPLASH_LINE1) - 1) * (MENU_FONT_WIDTH),
+                        text_width_1 = uint8_t(sizeof(STRING_SPLASH_LINE1) - 1) * uint8_t(MENU_FONT_WIDTH),
                         text_width_2 = 0;
     #else
-      constexpr uint8_t text_total_height = (MENU_FONT_HEIGHT) * 2,
+      constexpr uint8_t text_total_height = uint8_t(MENU_FONT_HEIGHT) * 2,
-                        text_width_1 = (sizeof(STRING_SPLASH_LINE1) - 1) * (MENU_FONT_WIDTH),
+                        text_width_1 = uint8_t(sizeof(STRING_SPLASH_LINE1) - 1) * uint8_t(MENU_FONT_WIDTH),
-                        text_width_2 = (sizeof(STRING_SPLASH_LINE2) - 1) * (MENU_FONT_WIDTH);
+                        text_width_2 = uint8_t(sizeof(STRING_SPLASH_LINE2) - 1) * uint8_t(MENU_FONT_WIDTH);
     #endif
     constexpr uint8_t text_max_width = _MAX(text_width_1, text_width_2),
                       rspace = width - (START_BMPWIDTH);