maemo/gconf: fix linting issues (!928)

MP:[AL13]:maemo/gconf/APKBUILD:17:cd "$builddir" can be removed in phase 'build'
MP:[AL13]:maemo/gconf/APKBUILD:30:cd "$builddir" can be removed in phase 'check'
MP:[AL13]:maemo/gconf/APKBUILD:35:cd "$builddir" can be removed in phase 'package'
MP:[AL32]:maemo/gconf/APKBUILD:12:unnecesary usage of braces: ${pkgver}

maemo/gconf/APKBUILD

@@ -9,12 +9,11 @@ license="GPL-2.0-or-later"
 depends_dev="libxml2-dev gtk+3.0-dev polkit-dev"
 makedepends="$depends_dev gobject-introspection-dev glib-dev intltool"
 subpackages="$pkgname-dev $pkgname-doc $pkgname-lang"
-source="https://download.gnome.org/sources/GConf/${pkgver%.*}/GConf-${pkgver}.tar.xz"
+source="https://download.gnome.org/sources/GConf/${pkgver%.*}/GConf-$pkgver.tar.xz"
 
 builddir="$srcdir"/GConf-"$pkgver"
 
 build() {
-	cd "$builddir"
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
@@ -27,12 +26,10 @@ build() {
 }
 
 check() {
-	cd "$builddir"
 	make check
 }
 
 package() {
-	cd "$builddir"
 	make DESTDIR="$pkgdir" install
 }