[NFC] Don't flush someone else's ob

[demeritcowboy]

Overview

It's risky to flush someone else's ob.
Interpret that however you want.

Before

I'm hoping #29425 will make this test show up as a fail. I've been seeing it in another environment.

After

Technical Details

I'm not sure if this line was added to solve some problem at the time, but the test doesn't start its own output buffer. Even if there is another one somewhere, it shouldn't be flushed here. It doesn't seem needed locally.

Comments

[civibot]

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