Update brave-appimage

- fall back on the beta version immediately preceding the stable version if the latter is not present

see srevinsaju/Brave-AppImage#14 and srevinsaju/Brave-AppImage#16 for more context

Author: ivan-hc

programs/x86_64/brave-appimage

@@ -13,6 +13,7 @@ chmod a+x ../remove || exit 1
 
 # DOWNLOAD AND PREPARE THE APP, $version is also used for updates
 version=$(curl -Ls https://api.github.com/repos/srevinsaju/Brave-AppImage/releases/latest | sed 's/[()",{} ]/\n/g' | grep -oi "https.*mage$" | grep -vi "i386\|i686\|aarch64\|arm64\|armv7l" | grep -i "stable" | head -1)
+[ -z "$version" ] && version=$(curl -Ls https://api.github.com/repos/srevinsaju/Brave-AppImage/releases?per_page=100 | tr '[]{}' '\n' | grep -i "stable\|beta" | awk '/Stable/,0' | sed 's/[()",{} ]/\n/g' | grep -oi "https.*mage$" | grep -vi "i386\|i686\|aarch64\|arm64\|armv7l" | head -1)
 wget "$version" || exit 1
 # Keep this space in sync with other installation scripts
 # Use tar fx ./*tar* here for example in this line in case a compressed file is downloaded.
@@ -35,7 +36,7 @@ SITE="srevinsaju/Brave-AppImage"
 version0=$(cat "/opt/$APP/version")
 version=$(curl -Ls https://api.github.com/repos/srevinsaju/Brave-AppImage/releases/latest | sed 's/[()",{} ]/\n/g' | grep -oi "https.*mage$" | grep -vi "i386\|i686\|aarch64\|arm64\|armv7l" | grep -i "stable" | head -1)
 [ -n "$version" ] || { echo "Error getting link"; exit 1; }
-if command -v appimageupdatetool >/dev/null 2>&1; then
+if ! echo "$version0" | grep -qi "beta" && command -v appimageupdatetool >/dev/null 2>&1; then
 	cd "/opt/$APP" || exit 1
 	appimageupdatetool -Or ./"$APP" && chmod a+x ./"$APP" && echo "$version" > ./version && exit 0
 fi