create-appimage.sh: try curl prior to wget

In CI, the attempt to download mkappimage sometimes fail with some cryptic:
```
ERROR 403: Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature..
```

Author: MartinPulec

data/scripts/Linux-AppImage/create-appimage.sh

@@ -117,13 +117,13 @@ fi
 
 add_fonts
 
-if command -v wget >/dev/null && wget -V | grep -q https; then
+if command -v curl >/dev/null; then
         dl() {
-                wget -O - ${GITHUB_TOKEN+--header "Authorization: token $GITHUB_TOKEN"} "$1"
+                curl --fail -sSL ${GITHUB_TOKEN+-H "Authorization: token $GITHUB_TOKEN"} "$1"
         }
-elif command -v curl >/dev/null; then
+elif command -v wget >/dev/null && wget -V | grep -q https; then
         dl() {
-                curl --fail -sSL ${GITHUB_TOKEN+-H "Authorization: token $GITHUB_TOKEN"} "$1"
+                wget -O - ${GITHUB_TOKEN+--header "Authorization: token $GITHUB_TOKEN"} "$1"
         }
 else
         echo "Neither wget nor curl was found - if one needed later, it will " \