issue #14 commit for review (#50)

source/main.c

@@ -217,6 +217,7 @@ int main(void)
                 {
                     draw_theme_install(SHUFFLE_INSTALL);
                     shuffle_install(themes_list, theme_count);
+                    shuffle_theme_count = 0;
                 }
             }
         }

source/themes.c

@@ -397,6 +397,7 @@ Result shuffle_install(Theme_s *themes_list, int theme_count)
         if (themes_list[i].in_shuffle)
         {
             shuffle_themes[count++] = &themes_list[i];
+            themes_list[i].in_shuffle = false;
         }
     }
     for (int i = 0; i < count; i++)