home: vim: remove 'nvim-osc52'

OSC52 supports has been added upstream, and is set up automatically when
`SSH_TTY` is set (and a few other conditions) in v0.10.

modules/home/vim/plugin/settings/ssh.lua

@@ -1,17 +0,0 @@
-if not require("ambroisie.utils").is_ssh() then
-    return
-end
-
-local function copy(lines, _)
-    require("osc52").copy(table.concat(lines, "\n"))
-end
-
-local function paste()
-    return { vim.fn.split(vim.fn.getreg(""), "\n"), vim.fn.getregtype("") }
-end
-
-vim.g.clipboard = {
-    name = "osc52",
-    copy = { ["+"] = copy, ["*"] = copy },
-    paste = { ["+"] = paste, ["*"] = paste },
-}