Change DEB version format.

[s3rj1k]

As per https://www.debian.org/doc/debian-policy/ch-controlfields.html#version we want to have only single ~ character in the version string and it must be the last splitter component of the entire version string.

Having multiple ~ in version string makes version comparison very unintuitive.

Consider this example:

0.1.0-999~buster-u1 > 0.1.0-7785001901~ef9e94e4f6~buster
0.1.0-999~buster-u1 < 0.1.0-7785001901-ef9e94e4f6~buster
0.1.0-999~buster < 0.1.0-7785001901~ef9e94e4f6~buster
0.1.0-999~buster < 0.1.0-7785001901-ef9e94e4f6~buster