removing the word boundary \b (#1607)

because of the word boundary \b sed fails to replace $BIT_SIZE_NAME from the binary url in macOS
diff --git a/scripts/format_binary_url.sh b/scripts/format_binary_url.sh
index bace6b1..dce7466 100755
--- a/scripts/format_binary_url.sh
+++ b/scripts/format_binary_url.sh
@@ -37,4 +37,4 @@
   bit_size_name=ia32
 fi
 
-sed -e 's/$BIT_SIZE_NAME\b/'$bit_size_name'/g' $url_file
+sed -e 's/$BIT_SIZE_NAME/'$bit_size_name'/g' $url_file