Description: Remove extra spaces from fields

IssueNo: https://gitee.com/openharmony/third_party_libpng/issues/I638WH
Feature or Bugfix: Bugfix
Binary Source: NO
Signed-off-by: Nxing-tai-zhang <zhangxingtai@huawei.com>

README.OpenSource

 [
-{
-"Name": " libpng ",
-"License": "libpng license",
-"License File": " LICENSE ",
-"Version Number": " 1.6.37 ",
-"Owner": " shangzhi@huawei.com ",
-"Upstream URL": " http://www.libpng.org/pub/png/libpng.html ",
-"Description": " Reference library for supporting the Portable Network Graphics (PNG) format. "
-}
+    {
+        "Name": "libpng",
+        "License": "libpng license",
+        "License File": "LICENSE",
+        "Version Number": "1.6.37",
+        "Owner": "shangzhi@huawei.com",
+        "Upstream URL": "http://www.libpng.org/pub/png/libpng.html",
+        "Description": "Reference library for supporting the Portable Network Graphics (PNG) format."
+    }
 ]
\ No newline at end of file