Pairing session timepicker fixes (#542)

* Remove unsupported min_time/max_time from timepicker (not in Slack API)

* Default timepickers to 8 AM / 5 PM

Author: kylehoehns

src/bot/requestPairingSession.ts

@@ -339,10 +339,8 @@ function buildSlotBlocks(slotNumber: number, state?: SlotState): (Block | KnownB
       element: {
         type: 'timepicker',
         action_id: startId,
-        min_time: '08:00',
-        max_time: '20:00',
-        ...(state?.startTime ? { initial_time: state.startTime } : {}),
-      } as any,
+        initial_time: state?.startTime ?? '08:00',
+      },
     },
     {
       type: 'input',
@@ -351,10 +349,8 @@ function buildSlotBlocks(slotNumber: number, state?: SlotState): (Block | KnownB
       element: {
         type: 'timepicker',
         action_id: endId,
-        min_time: '08:00',
-        max_time: '20:00',
-        ...(state?.endTime ? { initial_time: state.endTime } : {}),
-      } as any,
+        initial_time: state?.endTime ?? '17:00',
+      },
     },
   ];
 }