Scroll indicators shown when not required

[jagorrin]

Environment

If you are using latest version:

1. react-native -v: 0.60.6
2. react-native run-windows --info:
   System:
   OS: Windows 10 10.0.18363
   CPU: (12) x64 Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
   Memory: 18.01 GB / 31.84 GB
   Binaries:
   Node: 10.15.0 - C:\Program Files\nodejs\node.EXE
   Yarn: 1.21.1 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
   npm: 6.13.7 - C:\Program Files\nodejs\npm.CMD
   npmPackages:
   react: 16.8.6 => 16.8.6
   react-native: 0.60.6 => 0.60.6
   react-native-windows: 0.60.0-vnext.133 => 0.60.0-vnext.133
   rnpm-plugin-windows: 0.3.5 => 0.3.5
   Installed UWP SDKs:
   10.0.14393.0
   10.0.15063.0
   10.0.16299.0
   10.0.17134.0
   10.0.17749.0
   10.0.17763.0
   10.0.18362.0

Then, specify:

• Target Platform Version(s): 10.0.18362.0

• Target Device(s): Desktop

• Visual Studio Version: 2017

• Build Configuration: Debug

Steps to Reproduce

Create an application using react-native-windows and ensure that the elements you have visible are not vertically tall enough for a vertical scrollbar to be required. Also ensure that the elements you have visible are not horizontally wide enough for a horizontal scrollbar to be required.

Expected Behavior

No scroll indicators will be visible.

Actual Behavior

In my specific scenario, a vertical scroll indicator will always be shown, even when my content is not vertically tall enough to require a vertical scrollbar to be required.

[jagorrin]

Opened a PR for this fix above.

[jagorrin]

Closing since my fix was merged.