PEL: pad hex words displayed in error message

In the message registry under "Documentation" and "Message", users can
include the hex words as part of the error message. This change pads
the displayed hex words so that the full eight digit hex number is
displayed.

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I32c4204a1643b585dc1309f67976f4abb44fb04c
diff --git a/extensions/openpower-pels/src.cpp b/extensions/openpower-pels/src.cpp
index 538f3e2..4279a00 100644
--- a/extensions/openpower-pels/src.cpp
+++ b/extensions/openpower-pels/src.cpp
@@ -554,7 +554,7 @@
                             argSourceVals.size())
                     {
                         message.append(getNumberString(
-                            "0x%X", argSourceVals[wordIndex - 1]));
+                            "0x%08X", argSourceVals[wordIndex - 1]));
                     }
                     else
                     {