Improve semicolon delimiter consistency, fixes IsNetstandard property

Author: Arlodotexe

MultiTarget/AvailableTargetFrameworks.props

@@ -26,7 +26,7 @@
         <WpfLibTargetFrameworks Condition="'$(WpfLibTargetFrameworks)' == ''">net9.0;</WpfLibTargetFrameworks>
 
         <!-- Used for defining TargetFramework under platforms that need it -->
-        <DotnetStandardCommonTargetFramework Condition="'$(DotnetStandardCommonTargetFramework)' == ''">netstandard2.0</DotnetStandardCommonTargetFramework>
+        <DotnetStandardCommonTargetFramework Condition="'$(DotnetStandardCommonTargetFramework)' == ''">netstandard2.0;</DotnetStandardCommonTargetFramework>
         <DotnetCommonTargetFramework Condition="'$(DotnetCommonTargetFramework)' == ''">net9.0;</DotnetCommonTargetFramework>
     </PropertyGroup>
 </Project>

MultiTarget/EnabledMultiTargets.props

@@ -2,6 +2,6 @@
     <!--Indicates which MultiTargets are enabled via UseTargetFrameworks script. -->
     <!-- Do not commit changes made to default values by tooling. -->
   <PropertyGroup>
-    <EnabledMultiTargets>wasm;uwp;netstandard</EnabledMultiTargets>
+    <EnabledMultiTargets>wasm;uwp;netstandard;</EnabledMultiTargets>
   </PropertyGroup>
 </Project>

MultiTarget/UseTargetFrameworks.ps1

@@ -55,7 +55,7 @@ else {
 # When enabledMultiTargetsRegexPartial is empty, the regex will match everything.
 # To work around this, check if there's anything to remove before doing it.
 if ($enabledMultiTargets.Length -gt 0) {
-    $newFileContents = $fileContents -replace "\<EnabledMultiTargets\>(.+?)\<\/EnabledMultiTargets\>", "<EnabledMultiTargets>$enabledMultiTargets</EnabledMultiTargets>";
+    $newFileContents = $fileContents -replace "\<EnabledMultiTargets\>(.+?)\<\/EnabledMultiTargets\>", "<EnabledMultiTargets>$enabledMultiTargets;</EnabledMultiTargets>";
 }
 
 Set-Content -Force -Path $PSScriptRoot/EnabledMultiTargets.props -Value $newFileContents;