Update view.zep

Zephir\CompilerException: Cannot read variable 'cache_mode' because it wasn't declared in /home/ikhrustalev/Desktop/work/cphalcon/phalcon/mvc/view.zep on line 608

	   if cache_mode {
	-----------------^
Merge pull request #2524 from rznzippy/patch-1

Update view.zep