nvim: plugins: Fix snippets not showing up in completion

For some reason without adding the snippets to the runtime path,
snippets do now show up in completion.

Found the solution here though the issue is on Ultisnips
https://github.com/hrsh7th/nvim-cmp/issues/241

nvim/.config/nvim/lua/plugins.lua

@@ -122,9 +122,10 @@ local init = function ()
     'kshenoy/vim-signature',
   }
   -- Snippets
+  use 'hrsh7th/vim-vsnip'
   use {
     'rafamadriz/friendly-snippets',
-    'hrsh7th/vim-vsnip'
+    rtp = '.'
   }
   -- GDB support
   use 'sakhnik/nvim-gdb'