erroneous connection manager 'discard changes' warning

[eug3nix]

preconditions:
connections with non-standard db port should exist
connections with different technology should exist

steps to reproduce:

0. open connection mananger
1. select terminal or other non-postgres connnection
2. select postgres connection with non-standard port

observed:
the connection with non-standard port now has its port reset to its default (5432), connection form is 'dirty' and becomes saveable
when leaving connection the "discard changes" warning is shown

expected:
no connection mutation should occur

[eug3nix]

fixed