input: clean up messages with button combination names

Previously messages that printed key/button names would have extra
names in button combinations appended after the main message,
resulting in output like:
No bind found for key 'MOUSE_BTN1'.-MOUSE_BTN3

Add a function that creates a complete combination name and use that
for all such messages. The above example changes to:
No bind found for key 'MOUSE_BTN1-MOUSE_BTN3'.

Other affected messages are a input.conf parsing error message and a
message about a bound command being invalid.

0 files changed, 0 insertions, 0 deletions