lisp/org-colview.el: Update org-columns to respect global-visual-line-mode

* lisp/org-colview.el (org-columns): Prevent enabling `truncate-lines'
when `global-visual-line-mode' is enabled.

This fixes a bug where `org-columns' overlays were disabling wrapping
of lines when `global-visual-line-mode` was already activated, and so
therefore expectation was that the lines would continue wrapping.
This is because `org-columns' was setting truncate-lines to t, when
global-visual-line-mode requires it to be set to nil. The interaction
between the two caused the wrapping not to occur.

lisp/org-colview.el

@@ -879,7 +879,8 @@ When COLUMNS-FMT-STRING is non-nil, use it as the column format."
 	    (unless (local-variable-p 'org-colview-initial-truncate-line-value)
 	      (setq-local org-colview-initial-truncate-line-value
 			  truncate-lines))
-	    (setq truncate-lines t)
+            (if (not global-visual-line-mode)
+              (setq truncate-lines t))
 	    (dolist (entry cache)
 	      (goto-char (car entry))
 	      (org-columns--display-here (cdr entry)))))))))