[javascript mode] Indentation wrong inside switch statement

[njx]

1. Open demo/theme.html
2. At the end of the file, type switch (foo) { and hit Return

Result: cursor is indented 4 spaces
Expected: cursor should be indented 2 spaces, as in other block statements like if and for

[marijnh]

This is intentional (lines with case or default on them will be indented once, others inside a switch body are indented twice). I've added a mode option doubleIndentSwitch in the attached patch that can be used to turn this behaviour off (set to false).