nvim: make sig in status longer in wide windows

.config/nvim/lua/my/functions.lua

@@ -136,6 +136,9 @@ end
 
 function M.lsp_sig_status()
     local width = vim.o.columns / 3
+    if width > 50 then
+        width = width * 1.5
+    end
     return require('lsp_signature').status_line(width).label
 end