Make different-colored dragon scales be visually distinct.

ChangeLog.rtro

@@ -1,6 +1,12 @@
 ------------------------
 Changes for top of trunk
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+2023-08-05 Daniel Hawkins
+	* flesh/dragon/dragon_black_scale.rtro.111.png,
+	  flesh/dragon/dragon_blue_scale.rtro.111.png,
+	  flesh/dragon/dragon_green_scale.rtro.111.png,
+	  flesh/dragon/dragon_sca.rtro.111.png: Recolor within XPM palette to be visually distinct.
+
 2023-08-03 Daniel Hawkins
 	* mapbuilding/mb_burningfountain.rtro.111.png,
 	  mapbuilding/mbfountain.rtro.111.png: Redraw using retro fountains as guide. Reduced to XPM palette.