Fix the bug that the month of gps timestamp exif is off by 1.

bug:3468433
Change-Id: Iab4132bdf6515a4fb93e56c2ec31b04ea260f7be
diff --git a/libcamera/SecCamera.cpp b/libcamera/SecCamera.cpp
index 68e29fa..e17c878 100755
--- a/libcamera/SecCamera.cpp
+++ b/libcamera/SecCamera.cpp
@@ -3095,7 +3095,7 @@
         mExifInfo.gps_timestamp[2].num = tm_data.tm_sec;
         mExifInfo.gps_timestamp[2].den = 1;
         snprintf((char*)mExifInfo.gps_datestamp, sizeof(mExifInfo.gps_datestamp),
-                "%04d:%02d:%02d", tm_data.tm_year + 1900, tm_data.tm_mon, tm_data.tm_mday);
+                "%04d:%02d:%02d", tm_data.tm_year + 1900, tm_data.tm_mon + 1, tm_data.tm_mday);
 
         mExifInfo.enableGps = true;
     } else {