patch 9.1.0330: v9.1.0327 contains an unrelated change

Problem:  v9.1.0327 contains an unrelated change
Solution: Revert back $USR_VIMRC_FILE to $HOME instead of ~

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/os_unix.h b/src/os_unix.h
index 37b0ba2..d214a4a 100644
--- a/src/os_unix.h
+++ b/src/os_unix.h
@@ -236,7 +236,7 @@
 # ifdef VMS
 # define USR_VIMRC_FILE  "sys$login:.vimrc"
 # else
-#  define USR_VIMRC_FILE "~/.vimrc"
+#  define USR_VIMRC_FILE "$HOME/.vimrc"
 # endif
 #endif