UEB grade 2: Fix back-translation of whole word contractions followed by other contractions.

For example, the dot pattern for "thing" (⠹⠬) was previously being back-translated as "thising".
This occurred because certain uplow opcodes included cells such as ⠬ in a multi-cell pattern and the table compiler was setting a space attribute for any cells in a multi-cell uplow opcode. I don't know why (and the code pre-dates version control), but I can't think ofa good reason and removing this doesn't break any tests.
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