(chocolatey#2369) Do not trim forward slash from assembly path on Linux

Prevents the absolute path to the current assembly from being converted
to a relative path by the removal of the first forward slash.
Applicable to non-windows platforms, leaves Windows alone.

Co-Authored-By: Kim J. Nordmo <1474648+AdmiringWorm@users.noreply.github.com>

src/chocolatey/infrastructure/filesystem/DotNetFileSystem.cs

@@ -180,7 +180,7 @@ public string get_executable_path(string executableName)
 
         public string get_current_assembly_path()
         {
-            return Assembly.GetExecutingAssembly().CodeBase.Replace("file:///", string.Empty);
+            return Assembly.GetExecutingAssembly().CodeBase.Replace(Platform.get_platform() == PlatformType.Windows ? "file:///" : "file://", string.Empty);
         }
 
         #endregion