git: openjdk/loom: fibers: remove one unneeded waiting condition in JvmtiVTMTDisabler::start_VTMT

[duke]

Changeset: 779846d6
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2021-08-12 09:22:19 +0000
URL:       https://git.openjdk.java.net/loom/commit/779846d60ef6610a4b016581fdd39438a853867b

remove one unneeded waiting condition in JvmtiVTMTDisabler::start_VTMT

! src/hotspot/share/prims/jvmtiThreadState.cpp