[image_picker] maxWidth and maxHeight increase image size

### Steps to reproduce

1. store image in gallery. in my case it is 49kb size and 700*850 resolution
2. use method `pickMultiImage` with `maxWidth: 3000` and `maxHeight: 3000`

### Expected results

result image keeps resolution and size because it's smaller maxWidth and maxHeight

### Actual results

result image keeps resolution, but will have 98kb size

### Code sample

Code sample

```dart
ImagePicker().pickMultiImage(
maxWidth: 3000,
maxHeight: 3000,
);
```

### Screenshots or Video

Screenshots / Video demonstration

[Upload media here]

### Logs

Logs

```console
[Paste your logs here]
```

### Flutter Doctor output

Doctor output

```console
[!] Flutter (Channel [user-branch], 3.16.5, on macOS 13.0.1 22A400 darwin-arm64, locale en-RU)
! Flutter version 3.16.5 on channel [user-branch] at /Users/shabanov/flutter
Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/docs/get-started/install.
! Upstream repository unknown source is not a standard remote.
Set environment variable "FLUTTER_GIT_URL" to unknown source to dismiss this error.
• Framework revision 78666c8dc5 (10 weeks ago), 2023-12-19 16:14:14 -0800
• Engine revision 3f3e560236
• Dart version 3.2.3
• DevTools version 2.28.4
• If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at /Users/shabanov/Library/Android/sdk
• Platform android-34, build-tools 34.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.7+0-17.0.7b1000.6-10550314)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 14E300c
• CocoaPods version 1.11.3

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

[✓] Android Studio (version 2023.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.7+0-17.0.7b1000.6-10550314)

[✓] VS Code (version 1.86.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.82.0

[✓] Connected device (3 available)
• sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64 • Android 14 (API 34) (emulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 13.0.1 22A400 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 121.0.6167.184
! Error: Could not locate device support files. You may be able to resolve the issue by installing the latest version of Xcode from the Mac App Store or developer.apple.com.

[missing string: 869a8e318f07f3e2f42e11d435502286094f76de] (code 2)

[✓] Network resources
• All expected network resources are available.

! Doctor found issues in 1 category.
```