provision: Fix buggy bash_profile management code.
provision: Fix buggy bash_profile management code.

Apparently, the previous version would just append to .bash_profile
every single time :(.

brockwhittaker/zulip,rishig/zulip,shubhamdhama/zulip,jackrzhang/zulip,rishig/zulip,eeshangarg/zulip,synicalsyntax/zulip,Galexrt/zulip,brockwhittaker/zulip,timabbott/zulip,andersk/zulip,hackerkid/zulip,showell/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,rht/zulip,timabbott/zulip,mahim97/zulip,dhcrzf/zulip,andersk/zulip,zulip/zulip,showell/zulip,dhcrzf/zulip,showell/zulip,tommyip/zulip,jackrzhang/zulip,eeshangarg/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,kou/zulip,rht/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,hackerkid/zulip,hackerkid/zulip,shubhamdhama/zulip,shubhamdhama/zulip,rht/zulip,synicalsyntax/zulip,showell/zulip,brockwhittaker/zulip,kou/zulip,timabbott/zulip,kou/zulip,hackerkid/zulip,tommyip/zulip,brainwane/zulip,dhcrzf/zulip,kou/zulip,rht/zulip,rishig/zulip,rht/zulip,brainwane/zulip,mahim97/zulip,tommyip/zulip,brainwane/zulip,Galexrt/zulip,synicalsyntax/zulip,Galexrt/zulip,mahim97/zulip,rishig/zulip,synicalsyntax/zulip,showell/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,brainwane/zulip,punchagan/zulip,jackrzhang/zulip,punchagan/zulip,jackrzhang/zulip,jackrzhang/zulip,dhcrzf/zulip,synicalsyntax/zulip,rht/zulip,zulip/zulip,dhcrzf/zulip,punchagan/zulip,tommyip/zulip,rishig/zulip,eeshangarg/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,shubhamdhama/zulip,dhcrzf/zulip,kou/zulip,timabbott/zulip,rishig/zulip,rishig/zulip,shubhamdhama/zulip,hackerkid/zulip,Galexrt/zulip,tommyip/zulip,timabbott/zulip,shubhamdhama/zulip,showell/zulip,jackrzhang/zulip,eeshangarg/zulip,dhcrzf/zulip,andersk/zulip,brainwane/zulip,jackrzhang/zulip,punchagan/zulip,synicalsyntax/zulip,brockwhittaker/zulip,kou/zulip,shubhamdhama/zulip,punchagan/zulip,mahim97/zulip,brainwane/zulip,timabbott/zulip,kou/zulip,brockwhittaker/zulip,punchagan/zulip,andersk/zulip,brockwhittaker/zulip,mahim97/zulip,Galexrt/zulip,tommyip/zulip,zulip/zulip,tommyip/zulip,mahim97/zulip,Galexrt/zulip,zulip/zulip,Galexrt/zulip,punchagan/zulip