Reset $(AndroidCommandLineToolsVersion)=5.0

Context: dotnet/android#7073 (comment)

I *suspect* that bumping `$(AndroidCommandLineToolsVersion)`=7.0
is causing the `InstallAndroidDependenciesTest()` unit test to fail,
though I don't understand why.

Reset `$(AndroidCommandLineToolsVersion)`=5.0, and see if that fixes
things.

Author: jonpryor

src/Xamarin.Android.Tools.AndroidSdk/Xamarin.Android.Tools.Versions.props

@@ -10,7 +10,7 @@
     along with any other repo which references androidtools. 
     -->
     <AndroidSdkBuildToolsVersion Condition="'$(AndroidSdkBuildToolsVersion)' == ''">32.0.0</AndroidSdkBuildToolsVersion>
-    <AndroidCommandLineToolsVersion Condition=" '$(AndroidCommandLineToolsVersion)' == '' ">7.0</AndroidCommandLineToolsVersion>
+    <AndroidCommandLineToolsVersion Condition=" '$(AndroidCommandLineToolsVersion)' == '' ">5.0</AndroidCommandLineToolsVersion>
     <AndroidSdkPlatformToolsVersion Condition="'$(AndroidSdkPlatformToolsVersion)' == ''">32.0.0</AndroidSdkPlatformToolsVersion>
     <AndroidSdkEmulatorVersion Condition="'$(AndroidSdkEmulatorVersion)' == ''"></AndroidSdkEmulatorVersion>
     <AndroidSdkPlatformVersion Condition="'$(AndroidSdkPlatformVersion)' == ''">android-32</AndroidSdkPlatformVersion>