Open (=compile) Debug.iss when debugging ISCC, just like Compil32 opens it.

Projects/ISCC.dproj

@@ -69,6 +69,7 @@
         <DCC_Optimize>false</DCC_Optimize>
         <DCC_GenerateStackFrames>true</DCC_GenerateStackFrames>
         <DCC_ExeOutput>Bin</DCC_ExeOutput>
+        <Debugger_RunParams>Debug.iss</Debugger_RunParams>
     </PropertyGroup>
     <ItemGroup>
         <DelphiCompile Include="$(MainSource)">