tests: return value correctly

Author: dcampos

test/functional/snippy_spec.lua

@@ -907,7 +907,7 @@ describe('Snippy', function()
     end)
 
     it('virtual markers', function()
-        if exec_lua([[vim.fn.has('nvim-0.10')]]) == 0 then
+        if exec_lua([[return vim.fn.has('nvim-0.10')]]) == 0 then
             return
         end
         command('set filetype=lua')
@@ -941,7 +941,7 @@ describe('Snippy', function()
     end)
 
     it('virtual markers with numbers', function()
-        if exec_lua([[vim.fn.has('nvim-0.10')]]) == 0 then
+        if exec_lua([[return vim.fn.has('nvim-0.10')]]) == 0 then
             return
         end
         command('set filetype=lua')