Revert "Increase LSAN verbosity in Travis CI builds"

This reverts commit 7ec39330d2 because
enabling verbose ASAN output results in too much output for Travis to
handle (and, to be fair, for it to be useful).

build/tools/travis-ci.sh

@@ -73,9 +73,7 @@ case $wxTOOLSET in
         fi
 
         if [ "$wxUSE_ASAN" = 1 ]; then
-            # Increase verbosity in case something goes wrong and suppress the
-            # known leaks outside of wx itself that we can do nothing about.
-            export LSAN_OPTIONS=verbosity=1:log_threads=1:suppressions=$(pwd)/misc/suppressions/lsan
+            export LSAN_OPTIONS=suppressions=$(pwd)/misc/suppressions/lsan
 
             wxASAN_CFLAGS="-fsanitize=address -fno-omit-frame-pointer"
             wxASAN_CXXFLAGS=$wxASAN_CFLAGS