Fix Xcode_backend.sh for flavors (#27691)

packages/flutter_tools/bin/xcode_backend.sh

diff --git a/packages/flutter_tools/bin/xcode_backend.sh b/packages/flutter_tools/bin/xcode_backend.sh
index 6ec8dce..0537672 100755
--- a/packages/flutter_tools/bin/xcode_backend.sh
+++ b/packages/flutter_tools/bin/xcode_backend.sh
@@ -52,9 +52,9 @@
   local build_mode="$(echo "${FLUTTER_BUILD_MODE:-${CONFIGURATION}}" | tr "[:upper:]" "[:lower:]")"
   local artifact_variant="unknown"
   case "$build_mode" in
-    release*) build_mode="release"; artifact_variant="ios-release";;
-    profile*) build_mode="profile"; artifact_variant="ios-profile";;
-    debug*) build_mode="debug"; artifact_variant="ios";;
+    *release*) build_mode="release"; artifact_variant="ios-release";;
+    *profile*) build_mode="profile"; artifact_variant="ios-profile";;
+    *debug*) build_mode="debug"; artifact_variant="ios";;
     *)
       EchoError "========================================================================"
       EchoError "ERROR: Unknown FLUTTER_BUILD_MODE: ${build_mode}."