Astra: point to git tarball

astra.spec

@@ -4,7 +4,7 @@ Release:        0
 License:        GPLv3
 Summary:        Linux FFXIV launcher
 Url:            https://git.sr.ht/~redstrate/astra
-Source0:        https://git.sr.ht/~redstrate/astra/archive/main.tar.gz
+Source0:        https://xiv.zone/distrib/astra/git/astra-source.tar.gz
 
 BuildRequires:  appstream
 BuildRequires:  cmake
@@ -48,7 +48,7 @@ Requires:       hicolor-icon-theme
 Linux FFXIV launcher
 
 %prep
-%autosetup -n %{name}-main -p1
+%autosetup -c -p1
 
 %build
 %cmake_kf6 -DQT_MAJOR_VERSION=6