Update and rename apt_win32_dll_bergard_pgv_pvid_variant to…

Update and rename apt_win32_dll_bergard_pgv_pvid_variant to APT_win32_dll_bergard_pgv_pvid_variant.yar

malware/apt_win32_dll_bergard_pgv_pvid_variant → malware/APT_win32_dll_bergard_pgv_pvid_variant.yar

+/*
+    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.
+
+*/
 rule apt_win32_dll_bergard_pgv_pvid_variant
 {