minor: Remove redundant function names in Filter class.
minor: Remove redundant function names in Filter class.

We no longer use the style of giving a function name to a
function that already has a name from the object it gets
attached to.

rishig/zulip,kou/zulip,timabbott/zulip,brainwane/zulip,kou/zulip,andersk/zulip,zulip/zulip,punchagan/zulip,kou/zulip,zulip/zulip,tommyip/zulip,timabbott/zulip,showell/zulip,timabbott/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,kou/zulip,shubhamdhama/zulip,showell/zulip,shubhamdhama/zulip,rht/zulip,rishig/zulip,rishig/zulip,tommyip/zulip,punchagan/zulip,timabbott/zulip,hackerkid/zulip,zulip/zulip,brainwane/zulip,rht/zulip,dhcrzf/zulip,rishig/zulip,kou/zulip,tommyip/zulip,jackrzhang/zulip,showell/zulip,eeshangarg/zulip,shubhamdhama/zulip,dhcrzf/zulip,jackrzhang/zulip,dhcrzf/zulip,andersk/zulip,eeshangarg/zulip,hackerkid/zulip,jackrzhang/zulip,rht/zulip,tommyip/zulip,zulip/zulip,hackerkid/zulip,rishig/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,jackrzhang/zulip,rht/zulip,eeshangarg/zulip,showell/zulip,hackerkid/zulip,tommyip/zulip,rht/zulip,rht/zulip,dhcrzf/zulip,jackrzhang/zulip,zulip/zulip,synicalsyntax/zulip,timabbott/zulip,synicalsyntax/zulip,zulip/zulip,timabbott/zulip,brainwane/zulip,shubhamdhama/zulip,punchagan/zulip,tommyip/zulip,tommyip/zulip,hackerkid/zulip,shubhamdhama/zulip,zulip/zulip,andersk/zulip,brainwane/zulip,brainwane/zulip,brainwane/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,eeshangarg/zulip,andersk/zulip,synicalsyntax/zulip,synicalsyntax/zulip,rishig/zulip,shubhamdhama/zulip,jackrzhang/zulip,punchagan/zulip,dhcrzf/zulip,showell/zulip,dhcrzf/zulip,andersk/zulip,rht/zulip,synicalsyntax/zulip,punchagan/zulip,eeshangarg/zulip,shubhamdhama/zulip,jackrzhang/zulip,hackerkid/zulip,showell/zulip,synicalsyntax/zulip,showell/zulip,dhcrzf/zulip,timabbott/zulip,rishig/zulip,punchagan/zulip,eeshangarg/zulip