Fixed IsValidPath usages

(cherry picked from commit 033936dce7e13c8ab2e38407782dc9cdd949460e)

Closes #2313

src/NzbDrone.Core.Test/HealthCheck/Checks/RemotePathMappingCheckFixture.cs

@@ -78,7 +78,7 @@ namespace NzbDrone.Core.Test.HealthCheck.Checks
                 .Setup(x => x.FolderExists(It.IsAny<string>()))
                 .Returns((string path) =>
                 {
-                    Ensure.That(path, () => path).IsValidPath();
+                    Ensure.That(path, () => path).IsValidPath(PathValidationType.CurrentOs);
                     return false;
                 });
 
@@ -86,7 +86,7 @@ namespace NzbDrone.Core.Test.HealthCheck.Checks
                 .Setup(x => x.FileExists(It.IsAny<string>()))
                 .Returns((string path) =>
                 {
-                    Ensure.That(path, () => path).IsValidPath();
+                    Ensure.That(path, () => path).IsValidPath(PathValidationType.CurrentOs);
                     return false;
                 });
 

src/NzbDrone.Core/HealthCheck/Checks/RemotePathMappingCheck.cs

@@ -153,7 +153,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
                         return new HealthCheck(GetType(), HealthCheckResult.Error, _localizationService.GetLocalizedString("RemotePathMappingCheckImportFailed"), "#remote-path-import-failed");
                     }
 
-                    if (!dlpath.IsPathValid())
+                    if (!dlpath.IsPathValid(PathValidationType.CurrentOs))
                     {
                         if (!status.IsLocalhost)
                         {