oeqa selftest wic.py: apply build config to runqemu too

Build configuration is applied to bitbake build command
but removed before calling runqemu. Thus disabling KVM
support on aarc64 host was not effective. Note that this
pattern is used in a lot of tests. KVM gets enabled
via CI scripts.

(From OE-Core rev: 7a9fbf509fec2e149fd5702552bc4d819969ab1f)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/wic.py

@@ -1374,7 +1374,6 @@ IMAGE_CLASSES:remove = 'testimage'
         self.append_config(config)
         bitbake('core-image-base u-boot')
         runqemu_params = get_bb_var('TEST_RUNQEMUPARAMS', 'core-image-base') or ""
-        self.remove_config(config)
 
         with runqemu('core-image-base', ssh=False,
                      runqemuparams='%s nographic' % (runqemu_params), image_fstype='wic') as qemu:
@@ -1387,6 +1386,7 @@ IMAGE_CLASSES:remove = 'testimage'
             cmd = "cat /boot/loader/entries/boot.conf"
             status, output = qemu.run_serial(cmd)
             self.assertEqual(1, status, 'Failed to run command "%s": %s' % (cmd, output))
+        self.remove_config(config)
 
     @skipIfNotArch(['i586', 'i686', 'x86_64'])
     @OETestTag("runqemu")