examples: No need to explicitly seed the RNG at startup.

SDL does this for you; explicit seeding is only for reproducing a specific
sequence of numbers (or maybe reseeding at a later point).

examples/renderer/03-lines/lines.c

@@ -26,8 +26,6 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
         return SDL_APP_FAILURE;
     }
 
-    SDL_srand(0);  /* seed the random number generator */
-
     return SDL_APP_CONTINUE;  /* carry on with the program! */
 }