fix: native_constant_invocation - array constants with native constant names

[HypeMC]

Currently the native_constant_invocation tries to do the following:

- private const array CONNECTION_TIMEOUT = ['foo'];
+ private const array \CONNECTION_TIMEOUT = ['foo'];

[coveralls]

coverage: 95.637%. remained the same
when pulling 634c9e5 on HypeMC:fix-array-constants-with-native-constants-names
into 4e57f31 on PHP-CS-Fixer:master.