src: Eliminate randomness from sprinting distance

Stamina regen: Use std::ceil instead of roll_remainder in
update_stamina. This ensures that the floating-point value is always
rounded up (instead of only randomly being rounded up), and should give
at most 1 extra point of stamina regen.

Getting winded: Before, there was a random chance to become winded below
20% of maximum stamina, meaning total running distance could be cut
short by 8-12 steps or more (effectively capping maximum stamina at 80%,
at random). Now, becoming winded is more predictable, occurring only
upon reaching 0 stamina.

src/character.cpp

@@ -6315,7 +6315,7 @@ void Character::update_stamina( int turns )
     }
 
     // Roll to determine actual stamina recovery over this period
-    int recover_amount = roll_remainder( stamina_recovery * turns );
+    int recover_amount = std::ceil( stamina_recovery * turns );
     mod_stamina( recover_amount );
     add_msg_debug( debugmode::DF_CHARACTER, "Stamina recovery: %d", recover_amount );
 

src/game.cpp

@@ -10216,7 +10216,7 @@ void game::on_move_effects()
         if( !u.can_run() ) {
             u.toggle_run_mode();
         }
-        if( u.get_stamina() < u.get_stamina_max() / 5 && one_in( u.get_stamina() ) ) {
+        if( u.get_stamina() <= 0 ) {
             u.add_effect( effect_winded, 10_turns );
         }
     }