nls: slightly clean up compose sequences for mathematical operators

• approximate is ambiguous and most xkb implementations avoid this macro, so it is replaced with its Unnnn name in the sequence for U2247.
• includedin and leftshoe both resolve to U2282 in the sequences for U2284.
• includes and rightshoe both resolve to U2283 in the sequences for U2285.
• righttack is replaced with its Unnnn name to match its implementation in APL sequences.
• The sequences for therefore and because in the APL block are moved to ascending Unicode order.
• The comments for the sequences for U2299 is corrected to more accurately reflect its sequence nodes and its real name in Unicode.