KVM: selftests: x86: Sync the new name of the test case to .gitignore

Fixing side effect of the so-called opportunistic change in the commit.

Fixes: dc8a9febbab0 ("KVM: selftests: x86: Fix test failure on arch lbr capable platforms")
Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220518170118.66263-2-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/.gitignore

@@ -55,7 +55,7 @@
 /x86_64/xen_shinfo_test
 /x86_64/xen_vmcall_test
 /x86_64/xss_msr_test
-/x86_64/vmx_pmu_msrs_test
+/x86_64/vmx_pmu_caps_test
 /access_tracking_perf_test
 /demand_paging_test
 /dirty_log_test