sdl12-compat: CI: whoops, typo

From 6adbb4ba1666b94c6df5b1203016eff659e2c9dc Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 1 Jun 2021 18:31:09 -0400
Subject: [PATCH] CI: whoops, typo

---
 .github/workflows/main.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 903e9fc..910e21e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,6 +29,6 @@ jobs:
     - name: Configure CMake
       run: cmake -DSDL2_INCLUDE_DIR="${{ github.workspace }}/SDL2/include" -B build ${{ matrix.platform.flags }}
     - name: Build
-      working-directory: .build
+      working-directory: build
       run: cmake --build .