chat: set a minimum width for participant search list
chat: set a minimum width for participant search list

This was mainly targeted for collaboration chat window. It also looks and works good in regular Private Chat window.

alex-ionochkin/koding,kwagdy/koding-1,jack89129/koding,gokmen/koding,sinan/koding,rjeczalik/koding,rjeczalik/koding,szkl/koding,mertaytore/koding,drewsetski/koding,gokmen/koding,szkl/koding,andrewjcasal/koding,drewsetski/koding,acbodine/koding,jack89129/koding,drewsetski/koding,usirin/koding,sinan/koding,szkl/koding,gokmen/koding,acbodine/koding,sinan/koding,andrewjcasal/koding,usirin/koding,drewsetski/koding,kwagdy/koding-1,drewsetski/koding,kwagdy/koding-1,sinan/koding,andrewjcasal/koding,usirin/koding,alex-ionochkin/koding,andrewjcasal/koding,mertaytore/koding,szkl/koding,cihangir/koding,rjeczalik/koding,szkl/koding,jack89129/koding,koding/koding,sinan/koding,cihangir/koding,rjeczalik/koding,cihangir/koding,acbodine/koding,kwagdy/koding-1,gokmen/koding,cihangir/koding,mertaytore/koding,jack89129/koding,koding/koding,alex-ionochkin/koding,rjeczalik/koding,usirin/koding,jack89129/koding,koding/koding,andrewjcasal/koding,rjeczalik/koding,mertaytore/koding,gokmen/koding,gokmen/koding,gokmen/koding,szkl/koding,acbodine/koding,kwagdy/koding-1,alex-ionochkin/koding,sinan/koding,koding/koding,usirin/koding,mertaytore/koding,cihangir/koding,cihangir/koding,cihangir/koding,drewsetski/koding,gokmen/koding,alex-ionochkin/koding,alex-ionochkin/koding,kwagdy/koding-1,rjeczalik/koding,cihangir/koding,alex-ionochkin/koding,acbodine/koding,andrewjcasal/koding,drewsetski/koding,andrewjcasal/koding,acbodine/koding,jack89129/koding,alex-ionochkin/koding,koding/koding,sinan/koding,mertaytore/koding,sinan/koding,koding/koding,szkl/koding,drewsetski/koding,kwagdy/koding-1,koding/koding,jack89129/koding,jack89129/koding,koding/koding,rjeczalik/koding,acbodine/koding,usirin/koding,acbodine/koding,andrewjcasal/koding,kwagdy/koding-1,mertaytore/koding,mertaytore/koding,usirin/koding,szkl/koding,usirin/koding