Invalid conversation of DASH segment templates with format specifiers

[maxdavidson]

• [x ] I've verified and I assure that I'm running youtube-dl 2016.04.06
• [x ] Bug report (encountered problems with youtube-dl)

$ youtube-dl -v http://www.svtplay.se/video/7639352
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://www.svtplay.se/video/7639352']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.04.06
[debug] Python version 2.7.11 - Darwin-15.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.0.1, ffprobe 3.0.1, rtmpdump 2.4
[debug] Proxy map: {}
[SVTPlay] 7639352: Downloading JSON metadata
[SVTPlay] 7639352: Downloading MPD manifest
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 419, in main
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 409, in _real_main
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1725, in download
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 669, in extract_info
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 323, in extract
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/svt.py", line 124, in _real_extract
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/svt.py", line 37, in _extract_video
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1401, in _extract_mpd_formats
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1527, in _parse_mpd_formats
TypeError: %d format: a number is required, not dict

The change of regex in db8ee7e does not properly account for the case when the segment template contains a format specifier.

For example, the 'Number' block in this segment template is not picked up by the regex, and is left untouched:
'$RepresentationID$/$RepresentationID$_$Number%05d$.m4v'

The regex on this line should be changed into r'\$(Number|Bandwidth)%(\d+)d\$, to account for the 'd'.
https://github.com/rg3/youtube-dl/blob/2016.04.06/youtube_dl/extractor/common.py#L1519