fixing 'color' issue in plot3d

- if no color is given, color is revert back to 'self' when plotting the mooring lines.

Author: Yuksel-Rudy

famodel/project.py

@@ -2690,7 +2690,7 @@ def plot3d(self, ax=None, figsize=(10,8), plot_fowt=False, save=False,
                         else:
                             line.color = [0.5,0.5,0.5]
                     line.lw = lw
-                mooring.ss.drawLine(0, ax, color=color)
+                mooring.ss.drawLine(0, ax, color='self')
             elif mooring.parallels:
                 for i in mooring.i_sec:
                     sec = mooring.getSubcomponent(i)