Revert "[Fonts] Update material icons (#78311)"

[guidezpl]

This reverts commit e34f3b0.

Developers have reported a disconnect between the Icons class and the actual icon font. Reverting #78311 while I investigate

#79042
#79020

[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

[HansMuller]

LGTM

[Manjunath093]

iphone release build is showing wrong icons in emulator it is showing correct icons
expected icons is forward_ios_arrow
but wrong icon is getting folder_special

flutter doctor -v results

[✓] Flutter (Channel stable, 2.5.3, on macOS 12.0.1 21A559 darwin-x64, locale en-GB)
• Flutter version 2.5.3 at /Users/manjup/Downloads/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 1811693 (6 weeks ago), 2021-10-15 10:46:35 -0700
• Engine revision d3ea636dc5
• Dart version 2.14.4

[!] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/manjup/Library/Android/sdk
✗ cmdline-tools component is missing
Run path/to/sdkmanager --install "cmdline-tools;latest"

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2020.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:

[guidezpl]

Please create a new issue and @ me. Also please indicate the contents of flutter/bin/cache/material_fonts.stamp