Remove override for outer wall line width

This way the outer wall line width adjusts automatically to the user's value for the wall line width, if he chooses to change that.

resources/quality/nwa3d_a5/nwa3d_a5_best.inst.cfg

@@ -14,7 +14,6 @@ global_quality = True
 layer_height = 0.08
 layer_height_0 = 0.24
 line_width = 0.4
-wall_line_width_0 = 0.4
 initial_layer_line_width_factor = 100
 wall_thickness = 0.8
 wall_0_wipe_dist = 0.2

resources/quality/nwa3d_a5/nwa3d_a5_fast.inst.cfg

@@ -14,7 +14,6 @@ global_quality = True
 layer_height = 0.24
 layer_height_0 = 0.24
 line_width = 0.4
-wall_line_width_0 = 0.4
 initial_layer_line_width_factor = 100
 wall_thickness = 0.8
 wall_0_wipe_dist = 0.2

resources/quality/nwa3d_a5/nwa3d_a5_normal.inst.cfg

@@ -14,7 +14,6 @@ global_quality = True
 layer_height = 0.16
 layer_height_0 = 0.24
 line_width = 0.4
-wall_line_width_0 = 0.4
 initial_layer_line_width_factor = 100
 wall_thickness = 0.8
 wall_0_wipe_dist = 0.2