Drop unnecessary use of srcdir

Signed-off-by: David Runge <dvzrv@archlinux.org>

PKGBUILD

@@ -28,12 +28,12 @@ source=("${_pkgname}-${pkgver}.tar.gz::$url/archive/refs/tags/${pkgver}.tar.gz")
 b2sums=('ffbc08bcc75ad01721b503e7eb9033ee4131852c3813f3a1e40db60eab9ca210322ed05e6d9d0ef7f023bffce8278f181a542cee6f4fb711a10d6534c061be12')
 
 build() {
-  cd "${srcdir}/${_pkgname}-${pkgver}"
+  cd "${_pkgname}-${pkgver}"
   python -m build --wheel --no-isolation
 }
 
 check() {
-  cd "${srcdir}/${_pkgname}-${pkgver}"
+  cd "${_pkgname}-${pkgver}"
   # drop test files we cannot load
   PYTHONPATH="${PWD}/build/lib:${PWD}/src" pytest --continue-on-collection-errors \
     --ignore-glob='papermill/tests/test_abs.py' --ignore-glob='papermill/tests/test_adl.py' \
@@ -41,7 +41,7 @@ check() {
 }
 
 package() {
-  cd "${srcdir}/${_pkgname}-${pkgver}"
+  cd "${_pkgname}-${pkgver}"
   python -m installer --destdir="$pkgdir" dist/*.whl
   install -D LICENSE -t "${pkgdir}/usr/share/licenses/${pkgname}/"
 }