pbx.c: expand fields width of "core show hints"

pbx.c: expand fields width of "core show hints"

The current width for "extension" is 20 and "device state id" is 20, which is too small.
The "extension" field contains "ext"@"context", so 20 characters is not enough.
The "device state id" field, for example for Queue pause state contains Queue:"queue_name"_pause_PSJIP/"endpoint", so the 20 characters is not enough.

Increase the width of "extension" field to 30 characters and the width of the "device state id" field to 60 characters.

Resolves: #770

UserNote: The fields width of "core show hints" were increased.
The width of "extension" field to 30 characters and
the width of the "device state id" field to 60 characters.

(cherry picked from commit 75b550c8e1c938516ed7495e0a162f4e675231e0)