Werk #11824: Fix section sql_performance of mk_oracle.ps1

Component	Checks & agents
Title	Fix section sql_performance of mk_oracle.ps1
Date	Nov 30, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This removed a double qoute which caused sql_performance to fail.

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