table-printer: Fix left boundary check in comma-unique cell dedup

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In flatpak_table_printer_append_cell_with_comma_unique, the duplicate
check only verified the right boundary (match[len] == 0 or comma).
This caused false positives: searching for "all" in "superall" matched
because the character after "all" happened to be a comma, even though
"all" was a substring of "superall", not a separate comma-delimited
entry.

Calculate the position of each match via pointer arithmetic
(match - cell->text) and use cell->text[pos - 1] to check the left
boundary, so that a match is only treated as duplicate when it is at
the start of the cell or preceded by a comma.

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