Fix for Issue 159. (#161)

* Remove extra parens in -if-let binding form

* Revert "Remove extra parens in -if-let binding form"

This reverts commit d85dd98.

* Remove erroneous extra parens in -if-let binding form

This fixes #159

The previous commit was reverted, as that was incorrect.

Author: samebchase

lsp-treemacs-generic.el

@@ -86,7 +86,7 @@
        (if expanded?  "▾ " "▸ ")
      "  ")
    (or (plist-get item :icon-literal)
-       (-if-let ((icon (plist-get item :icon)))
+       (-if-let (icon (plist-get item :icon))
            (treemacs-get-icon-value
             icon
             nil