test: don't call clear() in both before_each() and after_each()

test/functional/lua/glob_spec.lua

@@ -5,7 +5,6 @@ local eq = t.eq
 
 describe('glob', function()
   before_each(n.clear)
-  after_each(n.clear)
 
   local match = function(pattern, str)
     return n.exec_lua(function()

test/functional/lua/snippet_spec.lua

@@ -33,7 +33,6 @@ describe('vim.snippet', function()
       set_snippet_jump(-1, '<S-Tab>')
     end)
   end)
-  after_each(clear)
 
   --- @param snippet string[]
   --- @param expected string[]