fix: Handle toggling logic outside the handler

* This way we can close the window while being focused in it. Before,
  the window was not closed because the handler wasn't called because no
  lsp was attached

lua/symbols-outline.lua

@@ -343,7 +343,6 @@ local function handler(_, _, result)
     if result == nil then return end
     D.state.code_win = vim.api.nvim_get_current_win()
 
-    if D.state.outline_buf == nil then
     setup_buffer()
     D.state.outline_items = parse(result)
     D.state.flattened_outline_items = flatten(parse(result))
@@ -355,13 +354,15 @@ local function handler(_, _, result)
                                 D.state.outline_win)
     write_details(D.state.outline_buf, details)
     setup_highlights()
-    else
-        vim.api.nvim_win_close(D.state.outline_win, true)
-    end
 end
 
 function D.toggle_outline()
-    vim.lsp.buf_request(0, "textDocument/documentSymbol", getParams(), handler)
+    if D.state.outline_buf == nil then
+        vim.lsp.buf_request(0, "textDocument/documentSymbol", getParams(),
+                            handler)
+    else
+        vim.api.nvim_win_close(D.state.outline_win, true)
+    end
 end
 
 function D.setup(opts)