Reset more character stats to zero for testing

Call player::environmental_revert_effect to remove addictions to e.g.
prevent opiate withdrawal from causing unexpected random pain in tests.

tests/player_helpers.cpp

@@ -71,6 +71,10 @@ void clear_character( player &dummy, bool debug_storage )
     item food( "debug_nutrition" );
     dummy.eat( food );
 
+    // This sets HP to max, clears addictions and morale,
+    // and sets hunger, thirst, fatigue and such to zero
+    dummy.environmental_revert_effect();
+
     dummy.empty_skills();
     dummy.clear_morale();
     dummy.clear_bionics();
@@ -97,9 +101,6 @@ void clear_character( player &dummy, bool debug_storage )
     dummy.set_dex_bonus( 0 );
     dummy.set_int_bonus( 0 );
     dummy.set_per_bonus( 0 );
-    dummy.reset_bonuses();
-    dummy.set_speed_base( 100 );
-    dummy.set_speed_bonus( 0 );
 
     dummy.cash = 0;