drop downs for hostgroup and hostname break frontend layout when names are long enough

Some related problems supposed to be fixed in ZBX-10289, but not all.

To reproduce:
Use browser on monitor with 1280 pixels wide.
Have a host with 100 characters long name and one graph for the host.
Go to Monitoring -> Graphs and see how drop downs location looks bad.

It gets even worse if host name is even longer or there are also group names with long names (for example 50 characters).

See attached screenshot.