Updates map_drops.yml (#7676)

* adjusted the rate in map_drops.yml to 1/100000 instead of 1/10000

Co-authored-by: Lemongrass3110 <lemongrass@kstp.at>

src/common/random.cpp

@@ -43,6 +43,3 @@ int32 rnd_value( int32 min, int32 max ){
 	return min + (int32)( rnd_uniform() * ( max - min + 1 ) );
 }
 
-bool rnd_chance( uint16 chance, uint16 base ){
-	return rnd_value( 0, base ) < chance;
-}