Changed height dimensions and color cable tie mount

cable_tie_mount/cable_tie_mount.scad

@@ -1,12 +1,11 @@
 $fn=50;
 l_lower = 20;
-h_lower = 4;
+h_lower = 2;
 l_higher = 10;
 h_higher = 1;
-h = 8;
-l_slot = 5;
-h_slot = 3;
+h = 5;
 b_cable_tie = 5;
+color("RoyalBlue", 1.0)
 difference () {
   hull(){
     cube([l_lower, l_lower, h_lower], center=true);