Update project file sdk references

Author: Tanaka

AppInstallerFileBuilder/AppInstallerFileBuilder/AppInstallerFileBuilder.csproj

@@ -11,7 +11,7 @@
     <AssemblyName>AppInstallerFileBuilder</AssemblyName>
     <DefaultLanguage>en-US</DefaultLanguage>
     <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
-    <TargetPlatformVersion Condition=" '$(TargetPlatformVersion)' == '' ">10.0.18362.0</TargetPlatformVersion>
+    <TargetPlatformVersion Condition=" '$(TargetPlatformVersion)' == '' ">10.0.17763.0</TargetPlatformVersion>
     <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
     <MinimumVisualStudioVersion>14</MinimumVisualStudioVersion>
     <FileAlignment>512</FileAlignment>

AppInstallerFileBuilder/AppInstallerFileBuilderLib/AppInstallerFileBuilderLib.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <Reference Include="Windows.Foundation.UniversalApiContract">
-      <HintPath>..\..\..\..\..\..\..\Program Files (x86)\Windows Kits\10\References\10.0.19023.0\Windows.Foundation.UniversalApiContract\10.0.0.0\Windows.Foundation.UniversalApiContract.winmd</HintPath>
+      <HintPath>C:\Program Files (x86)\Windows Kits\10\References\10.0.17763.0\Windows.Foundation.UniversalApiContract\7.0.0.0\Windows.Foundation.UniversalApiContract.winmd</HintPath>
       <IsWinMDFile>true</IsWinMDFile>
     </Reference>
   </ItemGroup>