style fix usage of clang-format directives

We do not use clang-format anymore, so the directive has been removed from most headers.

lv_conf_template.h is untouched as a convenience for downstream projects which still use the tool.

Fixes #2441

scripts/lv_conf_internal_gen.py

@@ -23,7 +23,7 @@ fout.write(
 
 #ifndef LV_CONF_INTERNAL_H
 #define LV_CONF_INTERNAL_H
-/*clang-format off*/
+/* clang-format off */
 
 #include <stdint.h>