patch 8.0.1136: W_WIDTH() is always the same

Problem:    W_WIDTH() is always the same.
Solution:   Expand the macro.
diff --git a/src/misc1.c b/src/misc1.c
index 369b716..f7789ff 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -495,7 +495,7 @@
     static varnumber_T prev_tick = 0;   /* changedtick of cached value */
     int		    bri = 0;
     /* window width minus window margin space, i.e. what rests for text */
-    const int	    eff_wwidth = W_WIDTH(wp)
+    const int	    eff_wwidth = wp->w_width
 			    - ((wp->w_p_nu || wp->w_p_rnu)
 				&& (vim_strchr(p_cpo, CPO_NUMCOL) == NULL)
 						? number_width(wp) + 1 : 0);
@@ -2026,7 +2026,7 @@
     /*
      * Add column offset for 'number', 'relativenumber' and 'foldcolumn'.
      */
-    width = W_WIDTH(wp) - win_col_off(wp);
+    width = wp->w_width - win_col_off(wp);
     if (width <= 0)
 	return 32000;
     if (col <= width)
@@ -2083,7 +2083,7 @@
     /*
      * Add column offset for 'number', 'relativenumber', 'foldcolumn', etc.
      */
-    width = W_WIDTH(wp) - win_col_off(wp);
+    width = wp->w_width - win_col_off(wp);
     if (width <= 0)
 	return 9999;