get offset properly even when it's only 1 or 2 digit

[fireattack]

The old way cannot properly process the following m3u8 (which I encountered):

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:5
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-START:TIME-OFFSET=0.0
#STREAM-DURATION:4440.021
#CURRENT-POSITION:0.042
#DMC-STREAM-DURATION:4440.021
#DMC-CURRENT-POSITION:0.042
#EXTINF:5.0,
42.ts?start=0.0&start_time=-572297465604&ht2_nicolive=4346020.0w4ty0ecip_sk25ag_7iacp11ig15q
#EXTINF:5.0,
5042.ts?start=0.0&start_time=-572297465604&ht2_nicolive=4346020.0w4ty0ecip_sk25ag_7iacp11ig15q
#EXTINF:5.0,
10042.ts?start=0.0&start_time=-572297465604&ht2_nicolive=4346020.0w4ty0ecip_sk25ag_7iacp11ig15q
#EXTINF:5.0,
15042.ts?start=0.0&start_time=-572297465604&ht2_nicolive=4346020.0w4ty0ecip_sk25ag_7iacp11ig15q
#EXTINF:5.0,
20042.ts?start=0.0&start_time=-572297465604&ht2_nicolive=4346020.0w4ty0ecip_sk25ag_7iacp11ig15q
#EXTINF:5.0,
25042.ts?start=0.0&start_time=-572297465604&ht2_nicolive=4346020.0w4ty0ecip_sk25ag_7iacp11ig15q

[Last-Order]

Thanks.