Minimap: Leaner minimap arrow makes it easier to see the direction

The arrow symbolizing the player in the square minimap looks almost like a
triangle, making it a bit hard to see which direction it is currently
pointing in when in a hurry.

Redraw it leaner, pointier. Colors unchanged.

README.txt

@@ -416,7 +416,7 @@ Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
 ShadowNinja:
   textures/base/pack/smoke_puff.png
 
-Paramat:
+paramat:
   textures/base/pack/menu_header.png
 
 erlehmann:
@@ -425,6 +425,9 @@ erlehmann:
   misc/minetest.svg
   textures/base/pack/logo.png
 
+JRottm
+  textures/base/pack/player_marker.png
+
 License of Minetest source code
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