Update test to account for new writing to log file in fisher_update.

test/update.fish

@@ -21,7 +21,7 @@ function -S teardown
 end
 
 test "$TESTNAME - Update plugin path"
-    (cat $path/foo) = $path/config/cache/foo
+    (cat $path/foo) = "$path/config/cache/foo --log=$path/config/cache/.debug"
 end
 
 test "$TESTNAME - Update index and Fisherman's home"