add hack to fix vimux incompatibility

basic/nvim/plugconf/vimux.lua

@@ -1,3 +1,6 @@
+-- Hack to replace dropped -p parameter
+vim.g.VimuxHeight = '0 -l 20%'
+
 -- Keyboard shortcuts
 if vim.env.TMUX ~= nil then
   vim.keymap.set('n', '<f5>', function()