fix(tests): missing clear() #18927

This was caught in #18674 since it allows test isolation

test/functional/api/buffer_updates_spec.lua

@@ -96,6 +96,8 @@ local function reopenwithfolds(b)
 end
 
 describe('API: buffer events:', function()
+  before_each(clear)
+
   it('when lines are added', function()
     local b, tick = editoriginal(true)
 

test/functional/api/version_spec.lua

@@ -93,6 +93,7 @@ describe("api metadata", function()
   local api, compat, stable, api_level
   local old_api = {}
   setup(function()
+    clear()  -- Ensure a session before requesting api_info.
     api = meths.get_api_info()[2]
     compat  = api.version.api_compatible
     api_level = api.version.api_level