Address warning: mismatched indentations at 'else' with 'case'

```
/path/to/sqlite3-ruby/lib/sqlite3/pragmas.rb:26: warning: mismatched indentations at 'else' with 'case' at 23
/path/to/sqlite3-ruby/lib/sqlite3/pragmas.rb:34: warning: mismatched indentations at 'else' with 'case' at 21
```
These mismatched indentations are corrected by RuboCop as follows.

```
$ rubocop --auto-correct --only Layout/ElseAlignment,Layout/CaseIndentation lib/sqlite3/pragmas.rb
```

https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/63141
relaxed the condition of this warning.

Author: yahonda

lib/sqlite3/pragmas.rb

@@ -19,19 +19,19 @@ def get_boolean_pragma( name )
     # integer that represents truth.
     def set_boolean_pragma( name, mode )
       case mode
-        when String
+      when String
           case mode.downcase
-            when "on", "yes", "true", "y", "t"; mode = "'ON'"
-            when "off", "no", "false", "n", "f"; mode = "'OFF'"
-            else
+          when "on", "yes", "true", "y", "t"; mode = "'ON'"
+          when "off", "no", "false", "n", "f"; mode = "'OFF'"
+          else
               raise Exception,
                 "unrecognized pragma parameter #{mode.inspect}"
           end
-        when true, 1
+      when true, 1
           mode = "ON"
-        when false, 0, nil
+      when false, 0, nil
           mode = "OFF"
-        else
+      else
           raise Exception,
             "unrecognized pragma parameter #{mode.inspect}"
       end