Modify the InstallLocation registry key; core-setup (#5238)

* Modify the 'InstallLocation' registry key.

src/corehost/common/pal.windows.cpp

@@ -261,7 +261,7 @@ bool get_sdk_self_registered_dir(pal::string_t* recv)
         dotnet_key_path = environmentRegistryPathOverride;
     }
 
-    pal::string_t sub_key = dotnet_key_path + pal::string_t(_X("\\Setup\\InstalledVersions\\")) + get_arch() + pal::string_t(_X("\\sdk"));
+    pal::string_t sub_key = dotnet_key_path + pal::string_t(_X("\\Setup\\InstalledVersions\\")) + get_arch();
     pal::char_t* value = _X("InstallLocation");
 
     // Must use RegOpenKeyEx to be able to specify KEY_WOW64_32KEY to access the 32-bit registry in all cases.

src/test/HostActivationTests/GivenThatICareAboutMultilevelSDKLookup.cs

@@ -641,8 +641,8 @@ namespace Microsoft.DotNet.CoreSetup.Test.HostActivation.MultilevelSDKLookup
             try
             {
                 string architecture = fixture.CurrentRid.Split('-')[1];
-                RegistryKey sdkKey = testKey.CreateSubKey($@"Setup\InstalledVersions\{architecture}\sdk");
-                sdkKey.SetValue("InstallLocation", _regDir);
+                RegistryKey dotnetLocationKey = testKey.CreateSubKey($@"Setup\InstalledVersions\{architecture}");
+                dotnetLocationKey.SetValue("InstallLocation", _regDir);
 
                 // Add SDK versions
                 AddAvailableSdkVersions(_regSdkBaseDir, "9999.0.4");