More robust nibtools build

SchwertUndMagieOnPebbleCompanionApp/app/src/main/jni/build_nibtools.sh

@@ -42,7 +42,11 @@ fi
 if [ ! -d "${SRC}" ]; then
     echo "Unpacking nibtools..."
     tar -xzf "${TARBALL}" -C "${SCRIPT_DIR}"
-    mv "${SCRIPT_DIR}"/nibtools-*/ "${SRC}"
+    # Hardcoded, not a glob: on a non-ephemeral runner workspace, a
+    # nibtools-*/ glob can also match SRC itself once it exists, or other
+    # stray nibtools-prefixed leftovers, and mv then fails with "target is
+    # not a directory" (multiple sources, no existing target dir).
+    mv "${SCRIPT_DIR}/nibtools-91344e0ee3" "${SRC}"
     echo "Unpacked to ${SRC}"
 fi