ts: remove explicit call to enter insert state in insertion commands

(This is now part of the `symex-define-insertion-command` macro)

symex-transformations-ts.el

@@ -147,15 +147,13 @@ If the deletion results in an empty line it will be removed."
   "Insert at beginning of symex."
   (interactive)
   (when (symex-ts-get-current-node)
-    (goto-char (symex-ts--node-start-position (symex-ts-get-current-node)))
-    (evil-insert-state)))
+    (goto-char (symex-ts--node-start-position (symex-ts-get-current-node)))))
 
 (defun symex-ts-insert-at-end ()
   "Insert at end of symex."
   (interactive)
   (when (symex-ts-get-current-node)
-    (goto-char (symex-ts--node-end-position (symex-ts-get-current-node)))
-    (evil-insert-state)))
+    (goto-char (symex-ts--node-end-position (symex-ts-get-current-node)))))
 
 (defun symex-ts-insert-before ()
   "Insert before symex (instead of vim's default at the start of line)."
@@ -179,8 +177,7 @@ alias for inserting at the end."
   (interactive)
   (when (symex-ts-get-current-node)
     (goto-char (symex-ts--node-end-position (symex-ts-get-current-node)))
-    (newline-and-indent)
-    (evil-insert-state)))
+    (newline-and-indent)))
 
 (defun symex-ts-open-line-before ()
   "Open new line before symex."