Moved RTC update function outside of draw procedure

Previous implementation caused increased drawing time when RTC datetime needed update every second

src/menu/menu.c

@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <time.h>
 
 #include <libdragon.h>
 
@@ -162,6 +163,8 @@ void menu_run (boot_params_t *boot_params) {
                     boot_pending = true;
                 }
             }
+
+            time(&menu->current_time);
         }
 
         while (audio_can_write()) {

src/menu/menu_state.h

@@ -8,6 +8,7 @@
 #define MENU_STRUCT_H__
 
 
+#include <time.h>
 #include "boot/boot.h"
 #include "flashcart/flashcart.h"
 #include "path.h"
@@ -64,6 +65,8 @@ typedef struct {
 
     char *error_message;
 
+    time_t current_time;
+
     struct {
         bool go_up;
         bool go_down;

src/menu/views/browser.c

@@ -262,14 +262,12 @@ static void draw (menu_t *menu, surface_t *d) {
         menu->browser.entries == 0 ? "" : "R: Info"
     );
 
-    time_t current_time = time(NULL);
-
-    if (current_time >= 0) {
+    if (menu->current_time >= 0) {
         component_actions_bar_text_draw(
             ALIGN_CENTER, VALIGN_TOP,
             "\n"
             "%s",
-            ctime(&current_time)
+            ctime(&menu->current_time)
         );
     }