tests/lsp: remove tsserver test

Lsp is deprecated and should be replaced with ts_ls

Author: khaneliman

tests/test-sources/plugins/lsp/_lsp.nix

@@ -210,7 +210,6 @@
             texlab.enable = true;
             tflint.enable = true;
             tinymist.enable = true;
-            tsserver.enable = true;
             typos-lsp.enable = true;
             typst-lsp.enable = true;
             vala-ls.enable = true;