eina: fix spelling in new eina_file_statgen API

Introduced in 9b294d6284 the new eina_file_statgen_* API has a typo in
its disable function. Fixing this before it gets out into a release.

Thanks goes to the https://abi-laboratory.pro service for offering their
great API/ABI reports to the open source communities to help finding such
things!

Differential Revision: https://phab.enlightenment.org/D9962

src/lib/eina/eina_file.h

@@ -798,7 +798,7 @@ EAPI void         eina_file_statgen_enable(void);
  * @brief Disable stat generation count optimiziing to only stat/do file i/o between generation counts changing
  * @since 1.23
  */
-EAPI void         eina_file_statgen_bisable(void);
+EAPI void         eina_file_statgen_disable(void);
 
 /**
  * @}

src/lib/eina/eina_file_common.c

@@ -108,7 +108,7 @@ eina_file_statgen_enable(void)
 }
 
 EAPI void
-eina_file_statgen_bisable(void)
+eina_file_statgen_disable(void)
 {
    eina_spinlock_take(&_eina_statgen_lock);
    _eina_statgen = 0;