Add expected field to psr fumble report

megamek/i18n/megamek/common/report-messages.properties

@@ -164,7 +164,7 @@
 2303=\ Engine stalled!
 2304=\ Engine restarted!
 2305=But, since the 'Mech is making a death from above attack, damage will be dealt during the physical phase.
-2306=); needs <data>, rolls <data> <font color='C00000'>Fumble!</font>: <msg:2301,2302>
+2306=); needs <data> [<data>], rolls <data> <font color='C00000'>Fumble!</font>: <msg:2301,2302>
 2310=<data> (<data>) falls on its <data>, suffering <data> damage.
 2315=<data> (<data>) falls on its <data>, suffering <data> damage when hitting the water surface and <data> when hitting the ground.
 2317=<data> goes back to the hull down position instead of falling to the ground.