ci: fix lint file list (hard_decision_out is inlined)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/user_project_ci.yml

@@ -24,5 +24,4 @@ jobs:
             -Wno-UNUSEDSIGNAL -Wno-UNDRIVEN \
             verilog/rtl/ldpc_decoder_top.sv \
             verilog/rtl/ldpc_decoder_core.sv \
-            verilog/rtl/wishbone_interface.sv \
+            verilog/rtl/wishbone_interface.sv
-            verilog/rtl/hard_decision_out.sv