fix RepeatMasker-4.1.2-p1 easyconfig by moving the database configure step to be after installation

[wdlingit]

fixes #15279

The change is simply to run the configure script at the installdir but not builddir. After installing, the builddir will be missing, and the path pointing to builddir (saved in the configure step) will become invalidate. Just like the steps described by RepeatMasker download page, the configure script is executed at where it was installed.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
node3502.doduo.os - Linux RHEL 8.4, x86_64, AMD EPYC 7552 48-Core Processor (zen2), Python 3.6.8
See https://gist.github.com/2771f4c1f91177484b71c483ecc039f1 for a full test report.

[boegelbot]

@wdlingit: Tests failed in GitHub Actions, see https://github.com/easybuilders/easybuild-easyconfigs/actions/runs/2440016355
Output from first failing test suite run:

FAIL: test_style_conformance (test.easyconfigs.styletests.StyleTest)
Check the easyconfigs for style
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test/easyconfigs/styletests.py", line 68, in test_style_conformance
    self.assertEqual(result, 0, error_msg)
  File "/opt/hostedtoolcache/Python/2.7.18/x64/lib/python2.7/site-packages/easybuild/base/testing.py", line 116, in assertEqual
    raise AssertionError("%s:\nDIFF%s:\n%s" % (msg, limit, ''.join(diff[:self.ASSERT_MAX_DIFF])))
AssertionError: There shouldn't be any code style errors (and/or warnings), found 4:
/home/runner/work/easybuild-easyconfigs/easybuild-easyconfigs/easybuild/easyconfigs/r/RepeatMasker/RepeatMasker-4.1.2-p1-foss-2020b.eb:39:1: E265 block comment should start with '# '
/home/runner/work/easybuild-easyconfigs/easybuild-easyconfigs/easybuild/easyconfigs/r/RepeatMasker/RepeatMasker-4.1.2-p1-foss-2020b.eb:40:1: E265 block comment should start with '# '
/home/runner/work/easybuild-easyconfigs/easybuild-easyconfigs/easybuild/easyconfigs/r/RepeatMasker/RepeatMasker-4.1.2-p1-foss-2020b.eb:41:1: E265 block comment should start with '# '
/home/runner/work/easybuild-easyconfigs/easybuild-easyconfigs/easybuild/easyconfigs/r/RepeatMasker/RepeatMasker-4.1.2-p1-foss-2020b.eb:48:20: E201 whitespace after '['

: 4 != 0:
DIFF:
- 4

----------------------------------------------------------------------
Ran 14820 tests in 708.236s

FAILED (failures=1)
ERROR: Not all tests were successful

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[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
node3108.skitty.os - Linux RHEL 8.4, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz, Python 3.6.8
See https://gist.github.com/fb9d32ef79627659a23d7372a95d520c for a full test report.

[boegel]

Trivial code style issues that are making tests fail are fixed in #15615