Fix tag parsing for numbers with line breaks

[tla]

e.g. the following (M3519 p. 192r l. 16–17)

յամին  <num value="401">.ն՟. 
և .ա՟</num>ին. եղև

currently becomes

                {
                    "n": "401ին",
                    "t": ".ն՟. և .ա՟ին",
                    "lit": ".ն՟. և .ա՟ին",
                    "context": "text/body/p[4]/num[1]",
                 }

when it should be

                {
                    "n": "401ին",
                    "t": ".ն՟. և .ա՟ին",
                    "lit": "<num value=\"401\">.ն՟. <lb [...]/>և .ա՟</num>ին",
                    "context": "text/body/p[4]",
                 }