Remove whatwg-fetch polyfill

[hawkrives]

I'm mainly curious what buildsize will say here

[buildsize]

File name	Previous Size	New Size	Change
404.html	861 bytes	861 bytes	0 bytes (0%)
app.css	83.97 KB	83.97 KB	0 bytes (0%)
app.js	1.13 MB	1.12 MB	-7.45 KB (1%)
areaData.url	50 bytes	50 bytes	0 bytes (0%)
chunk.area-editor.components.js	200.82 KB	200.82 KB	0 bytes (0%)
chunk.course-overlay.components.js	65.34 KB	65.34 KB	0 bytes (0%)
chunk.course-table.components.js	73.85 KB	73.85 KB	0 bytes (0%)
chunk.degub.components.js	2.48 KB	2.48 KB	0 bytes (0%)
chunk.new-student.drive.component.js	1.44 KB	1.44 KB	0 bytes (0%)
chunk.new-student.import.component.js	23.31 KB	23.31 KB	0 bytes (0%)
chunk.new-student.manual.component.js	61.94 KB	61.94 KB	0 bytes (0%)
chunk.new-student.upload.component.js	33.58 KB	33.58 KB	0 bytes (0%)
chunk.search-sidebar.components.js	65.45 KB	65.45 KB	0 bytes (0%)
chunk.semester-detail.components.js	2.1 KB	2.1 KB	0 bytes (0%)
chunk.share-student.components.js	26.24 KB	26.24 KB	0 bytes (0%)
chunk.student.components.js	130 KB	130 KB	0 bytes (0%)
courseData.url	38 bytes	38 bytes	0 bytes (0%)
google04990d0c4887a5cd.html	53 bytes	53 bytes	0 bytes (0%)
index.html	695 bytes	695 bytes	0 bytes (0%)