Don't count augmented innate mutations for silver damage.

If you had an innate mutation at non-maximum level, then gained the last
level as a non-innate mutation, how_mutated was counting all the levels,
including the innate ones.  This meant that a minotaur who got Horns
from !benemut would take three times as much silver damage as one who
got, say, scales.

This doesn't affect demonspawn, whose innate mutations do count for
purposes of silver damage.

1 files changed, 4 insertions, 0 deletions

diff --git a/crawl-ref/source/mutation.cc b/crawl-ref/source/mutation.cc
index e0ea9a5151..47341d4c0d 100644
--- a/crawl-ref/source/mutation.cc
+++ b/crawl-ref/source/mutation.cc
@@ -2419,7 +2419,11 @@ int how_mutated(bool all, bool levels)
                 continue;
 
             if (levels)
+            {
                 j += you.mutation[i];
+                if (!all)
+                    j -= you.innate_mutation[i];
+            }
             else
                 j++;
         }