Fix regex string for **Del and **DelVals
Fix regex string for **Del and **DelVals

The regex string that updates the Registry.pol file wasn't properly
matching instances where the reg_key was prepended with **Del or
**DelVals due to the utf-16-le encoding of the Registry.pol file.

This adds the null byte characters to the regex portion that searches
for those values.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt