fix uscan with version mangling

1 job for debian/master in 6 minutes and 34 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #153137
build

00:06:34

 
Name Stage Failure
failed
build Test
   /im-tomu/tomu-bootloader/archive/v2.0-rc2.tar.gz (2.0-rc2) index=2.0-rc2-1 
/im-tomu/tomu-bootloader/archive/v2.0-rc1.tar.gz (2.0-rc1) index=2.0-rc1-1
uscan info: opts: uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/
uscan info: line:
uscan info: Parsing uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/
uscan info: line:
uscan info: watch line only with opts="..." and no URL
uscan info: Scan finished
ERROR: Job failed: exit code 1