Werk #15312: mk_oracle: use "${GREP}" instead of "grep"

Component	Checks & agents
Title	mk_oracle: use "${GREP}" instead of "grep"
Date	Nov 27, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p16 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

When executed on solaris, "grep" does not know -x or -F. "${GREP}" points to a version of grep that understands those options.

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