Update StyleCI fixers, disable explicit_string_variable & explicit_indirect_variable

Author: Omranic

.styleci.yml

@@ -25,13 +25,11 @@ enabled:
   - length_ordered_imports
   - modernize_types_casting
   - non_printable_character
-  - explicit_string_variable
   - no_unneeded_final_method
   - ternary_to_elvis_operator
   - blank_line_before_declare
   - combine_consecutive_issets
   - combine_consecutive_unsets
-  - explicit_indirect_variable
   - ternary_to_null_coalescing
   - escape_implicit_backslashes
   - fully_qualified_strict_types