fix(language/sh): only activate tree-sitter in sh and bash scripts

The tree-sitter grammars don't work properly with zsh scripts for
example, so only activate tree-sitter if sh-shell is bash or sh.

modules/languages/siren-sh.el

@@ -44,8 +44,11 @@
 
   :preface
   (defun siren-lsp-bash-mode-setup ()
-    (if (member sh-shell '(bash sh))
-        (lsp-deferred)))
+    (when (member sh-shell '(bash sh))
+      (if (fboundp 'lsp-deferred)
+          (lsp-deferred))
+      (if (fboundp 'tree-sitter-mode)
+          (tree-sitter-mode t))))
 
   :config
   ;; Create custom lsp-client for shellcheck diagnostics via efm-langserver.

modules/text-editing/siren-tree-sitter.el

@@ -14,7 +14,6 @@
     php-mode
     ruby-mode
     rust-mode
-    sh-mode
     terraform-mode
     typescript-mode
     yaml-mode) . siren-tree-sitter-mode-enable)