Call update() when reparing signs.

It boggles the mind that this tiny little class has worked as intended
since 2011 (!!), and all of a sudden, signs no longer retain their text
in the repair procedure...

By calling the somewhat arbitrary `update()` method on the sign after
setting the contents, the sign appears to correctly update again.

Fixes #772

changelog.md

@@ -15,6 +15,7 @@ These changes will (most likely) be included in the next version.
 - Explosion damage caused by Exploding Sheep now correctly counts as monster damage. This means that the explosions only affect other mobs if the per-arena setting `monster-infight` is set to `true`.
 - Explosion damage caused by the boss ability `obsidian-bomb` now correctly counts as monster damage. This means that the explosions only affect other mobs if the per-arena setting `monster-infight` is set to `true`.
 - An old discrepancy with auto start timers in the auto-ready logic has been removed. This fixes an issue in MobArenaStats where the extension would throw errors in arenas with `auto-ready: true` and a non-zero auto start timer. Note that the combination of `auto-ready: true` and a `default-class` now _requires_ the use of a `start-delay-timer` to prevent the arena from starting immediately when the first player joins.
+- Signs now correctly restore themselves again in arenas with `soft-restore: true`.
 
 ## [0.107] - 2022-07-30
 ### Added

src/main/java/com/garbagemule/MobArena/repairable/RepairableSign.java

@@ -27,6 +27,7 @@ public void repair()
         s.setLine(1, lines[1]);
         s.setLine(2, lines[2]);
         s.setLine(3, lines[3]);
+        s.update();
     }
 
 }