Enable autocorrect for `Lint/EndAlignment` cop

### Summary

This PR changes .rubocop.yml.

Regarding the code using `if ... else ... end`, I think the coding style
that Rails expects is as follows.

```ruby
var = if cond
  a
else
  b
end
```

However, the current .rubocop.yml setting does not offense for the
following code.

```ruby
var = if cond
        a
      else
        b
      end
```

I think that the above code expects offense to be warned.
Moreover, the layout by autocorrect is unnatural.

```ruby
var = if cond
  a
      else
        b
      end
```

This PR adds a setting to .rubocop.yml to make an offense warning and
autocorrect as expected by the coding style.
And this change also fixes `case ... when ... end` together.

Also this PR itself is an example that arranges the layout using
`rubocop -a`.

### Other Information

Autocorrect of `Lint/EndAlignment` cop is `false` by default.
https://github.com/bbatsov/rubocop/blob/v0.51.0/config/default.yml#L1443

This PR changes this value to `true`.

Also this PR has changed it together as it is necessary to enable
`Layout/ElseAlignment` cop to make this behavior.

.rubocop.yml

@@ -26,6 +26,9 @@ Layout/CaseIndentation:
 Layout/CommentIndentation:
   Enabled: true
 
+Layout/ElseAlignment:
+  Enabled: true
+
 Layout/EmptyLineAfterMagicComment:
   Enabled: true
 
@@ -140,6 +143,7 @@ Style/UnneededPercentQ:
 Lint/EndAlignment:
   Enabled: true
   EnforcedStyleAlignWith: variable
+  AutoCorrect: true
 
 # Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
 Lint/RequireParentheses: