syz-manager: fix bug in repro logic
syz-manager: fix bug in repro logic

We did not check phase when creating new instances for fuzzing.

dotweiba/syzkaller,dotweiba/syzkaller,google/syzkaller,google/syzkaller,zoulasc/syzkaller,hyz0906/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,zoulasc/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,google/syzkaller,hyz0906/syzkaller,dotweiba/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,hyz0906/syzkaller,google/syzkaller,dotweiba/syzkaller