Use SetInstallXLogFileSegmentActive() for setting XLogCtl->InstallXLogFileSegmentActive

[Bharath Rupireddy]

Hi,

Here's a small patch replacing the explicit setting of
XLogCtl->InstallXLogFileSegmentActive with the existing function
SetInstallXLogFileSegmentActive(), removes duplicate code and saves 4
LOC.

-- 
Bharath Rupireddy
RDS Open Source Databases: https://aws.amazon.com/rds/postgresql/

v1-0001-Use-SetInstallXLogFileSegmentActive.patch
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