medical: Redo div by zero fix

i think this should make it more consistent with the code?

medical/module/medical_wound.zsc

@@ -247,7 +247,6 @@ extend class UaS_Wound {
 			location.y * bleeder.height);
 		vector3 interpvel = level.Vec3Diff(oldpos, off);
 		double avgsize = (width + depth) / 2.0;
-		float bludalpha = (width > 0.)? (depth / width) : 0;
 
 		// Spawn a wound particle;
 		if (depth >= 8) { BP.Texture = TexMan.CheckForTexture ("BLUDC0"); }
@@ -262,7 +261,8 @@ extend class UaS_Wound {
 		BP.Flags = SPF_REPLACE;
 		BP.FadeStep = 0;
 		BP.Style = STYLE_Normal;
-		BP.StartAlpha = min(1, max(bludalpha, 0.3));
+		if (width > 0.) { BP.StartAlpha = min(1, max((depth / width), 0.3)); }
+		else { BP.StartAlpha = 0.3; }
 		level.SpawnParticle(BP);
 
 		// Do appearing and drops running down body