log: do not hide the public phase in debug mode (BC)

When 51fc43253a52 introduced phases to the `hg log --debug` output, it
also disabled outputting public phase. At the same time, it always
shows phases in the default template, `hg log --debug -T default`.
Those two should produce the same output, but they don't.

I think it makes a lot more sense to always show all phases. There's
already loss of backwards compatibility in this case when using a
newer hg on an old hg repo, since draft commits will show up in the
output of `hg log --debug`.

Finally, I just don't think that any sort of information should be
hidden with --debug. This flag should be about showing as much
information as possible.

mercurial/cmdutil.py

@@ -916,7 +916,7 b' class changeset_printer(object):'
             # i18n: column positioning for "hg log"
             self.ui.write(_("tag:         %s\n") % tag,
                           label='log.tag')
-        if self.ui.debugflag and ctx.phase():
+        if self.ui.debugflag:
             # i18n: column positioning for "hg log"
             self.ui.write(_("phase:       %s\n") % _(ctx.phasestr()),
                           label='log.phase')

tests/test-alias.t

@@ -208,6 +208,7 b' properly recursive'
 
   $ hg dln
   changeset:   -1:0000000000000000000000000000000000000000
+  phase:       public
   parent:      -1:0000000000000000000000000000000000000000
   parent:      -1:0000000000000000000000000000000000000000
   manifest:    -1:0000000000000000000000000000000000000000

tests/test-globalopts.t

@@ -234,6 +234,7 b' Testing --debug:'
   $ hg --cwd c log --debug
   changeset:   1:b6c483daf2907ce5825c0bb50f5716226281cc1a
   tag:         tip
+  phase:       public
   parent:      -1:0000000000000000000000000000000000000000
   parent:      -1:0000000000000000000000000000000000000000
   manifest:    1:23226e7a252cacdc2d99e4fbdc3653441056de49
@@ -246,6 +247,7 b' Testing --debug:'
   
   
   changeset:   0:8580ff50825a50c8f716709acdf8de0deddcd6ab
+  phase:       public
   parent:      -1:0000000000000000000000000000000000000000
   parent:      -1:0000000000000000000000000000000000000000
   manifest:    0:a0c8bcbbb45c63b90b70ad007bf38961f64f2af0

tests/test-phases.t

@@ -340,6 +340,7 b' test that phase are displayed in log at '
   
   
   changeset:   1:27547f69f25460a52fff66ad004e58da7ad3fb56
+  phase:       public
   parent:      0:4a2df7238c3b48766b5e22fafbb8a2f506ec8256
   parent:      -1:0000000000000000000000000000000000000000
   manifest:    1:cb5cbbc1bfbf24cc34b9e8c16914e9caa2d2a7fd
@@ -352,6 +353,7 b' test that phase are displayed in log at '
   
   
   changeset:   0:4a2df7238c3b48766b5e22fafbb8a2f506ec8256
+  phase:       public
   parent:      -1:0000000000000000000000000000000000000000
   parent:      -1:0000000000000000000000000000000000000000
   manifest:    0:007d8c9d88841325f5c6b06371b35b4e8a2b1a83