Revert changes to mysql initializer

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

config/initializers/mysql_set_length_for_binary_and_text_indexes.rb → config/initializers/mysql_set_length_for_binary_indexes.rb

-# This patches ActiveRecord so indexes for binary and text columns created
+# This patches ActiveRecord so indexes for binary columns created
 # using the MySQL adapter apply a length of 20. Otherwise MySQL can't create an
-# index on binary and text columns.
+# index on binary columns.
 
-module MysqlSetLengthForBinaryAndTextIndex
+module MysqlSetLengthForBinaryIndex
   def add_index(table_name, column_names, options = {})
     Array(column_names).each do |column_name|
       column = ActiveRecord::Base.connection.columns(table_name).find { |c| c.name == column_name }
 
-      if column&.type == :binary || column&.type == :text
+      if column&.type == :binary
         options[:length] = 20
       end
     end
@@ -17,5 +17,5 @@ module MysqlSetLengthForBinaryAndTextIndex
 end
 
 if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
-  ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:prepend, MysqlSetLengthForBinaryAndTextIndex)
+  ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:prepend, MysqlSetLengthForBinaryIndex)
 end