nvim: perlls: remove broken check and disable autostart

.config/nvim/lua/my/lsp.lua

@@ -193,13 +193,12 @@ if vim.fn.executable('gopls') > 0 then
     })
 end
 
--- FIXME: binary probably doesn't exist even when installed
-if vim.fn.executable('perlls') > 0 then
-    lspconfig.perlls.setup({
-        on_attach = on_attach,
-        capabilities = capabilities
-    })
-end
+-- there is no good and fast enough way to check for its existence
+lspconfig.perlls.setup({
+    autostart = false,
+    on_attach = on_attach,
+    capabilities = capabilities
+})
 
 if vim.fn.executable('qml-lsp') > 0 then
     lspconfig.qml_lsp.setup({