delete some duplicated tests

[cyrgani]

Delete some tests which have almost-exact duplicates (only difference is formatting or the concrete integer values used) in the tests/ui/moves directory.

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[bjorn3]

I did some digging and it looks like there were originally tests for @T (managed boxes, aka GCed pointers) added in 78b0d33, which were then copied for ~T (unique boxes) in 18b01d5. Later both @T and ~T were changed to Box<T> in aa48654 and 090040b respectively.