metacity: upgrade 3.52.0 -> 3.56.0

Changelog:
3.56.0
- Use window icon for the menu button.

3.54.0
- Add basic color-scheme support.
- Updated translations.

As an oe-related change, it also solves a build failure for 32-bit targets:

| ../../metacity-3.52.0/src/core/screen.c: In function 'collect_timed_out_foreach':
| ../../metacity-3.52.0/src/core/screen.c:2431:55: error: passing argument 2 of 'sn_startup_sequence_get_last_active_time' from incompatible pointer type [-Wincompatible-pointer-types]
|  2431 |   sn_startup_sequence_get_last_active_time (sequence, &tv_sec, &tv_usec);
|       |                                                       ^~~~~~~
|       |                                                       |
|       |                                                       long int *

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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