Fix [1875709]: Make Mountain Dwarves' experience modifier in tables.txt

match the one they have in species_exp_mod().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3308 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 20, 2008
3T7XVIR335FHDHB2UQ4KFORVNTER2HNSOYC7XN5ZIYHA6RN5HFVQC
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