rm obsolete getter.

[stopfstedt]

this one isn't used anywhere. the only shortTitle attr on a model that comes up is the one on the program class.

stefan@nichtsnutz: ~/dev/projects/frontend on ungunk[$]
$ grep -r '\.shortTitle' packages --exclude-dir=dist --exclude-dir=node_modules --exclude-dir=tests
packages/frontend/app/components/program/overview.gjs:    this.shortTitle = this.args.program.shortTitle;
packages/frontend/app/components/program/overview.gjs:    if (this.shortTitle !== this.args.program.shortTitle) {
packages/frontend/app/components/program/overview.gjs:      this.args.program.set('shortTitle', this.shortTitle);
packages/frontend/app/components/program/overview.gjs:      this.shortTitle = this.args.program.shortTitle;
packages/frontend/app/components/program/overview.gjs:                @value={{this.shortTitle}}
packages/frontend/app/components/program/overview.gjs:                  value={{this.shortTitle}}
packages/frontend/app/components/program/overview.gjs:                @validationErrors={{this.validations.errors.shortTitle}}
packages/frontend/app/components/program/overview.gjs:              {{this.shortTitle}}
packages/frontend/app/components/curriculum-inventory/report-overview.gjs:              {{#if @report.program.shortTitle}}
packages/frontend/app/components/curriculum-inventory/report-overview.gjs:                ({{@report.program.shortTitle}})

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[dartajax]

tested on program short title for what that's worth - seems fine to me

[dartajax]

Visual Diff stuff looks fine to me = this PR is ready to be merged as far as I can tell.