In build jobs, properly disable UR downloads

These jobs were not properly setting `SYCL_UR_USE_FETCH_CONTENT`, and so
were fetching UR when they should have been using the UR under test.

Author: RossBrunton

.github/workflows/benchmarks_compute.yml

@@ -143,8 +143,8 @@ jobs:
         --ci-defaults ${{matrix.adapter.sycl_config}}
         --cmake-opt="-DLLVM_INSTALL_UTILS=ON"
         --cmake-opt="-DSYCL_PI_TESTS=OFF"
-        --cmake-opt="-DSYCL_PI_UR_USE_FETCH_CONTENT=OFF"
-        --cmake-opt="-DSYCL_PI_UR_SOURCE_DIR=${{github.workspace}}/ur-repo/"
+        --cmake-opt="-DSYCL_UR_USE_FETCH_CONTENT=OFF"
+        --cmake-opt="-DSYCL_UR_SOURCE_DIR=${{github.workspace}}/ur-repo/"
         --cmake-opt=-DCMAKE_C_COMPILER_LAUNCHER=ccache
         --cmake-opt=-DCMAKE_CXX_COMPILER_LAUNCHER=ccache
 

.github/workflows/e2e_core.yml

@@ -130,8 +130,8 @@ jobs:
         --ci-defaults ${{matrix.adapter.config}}
         --cmake-opt="-DLLVM_INSTALL_UTILS=ON"
         --cmake-opt="-DSYCL_PI_TESTS=OFF"
-        --cmake-opt="-DSYCL_PI_UR_USE_FETCH_CONTENT=OFF"
-        --cmake-opt="-DSYCL_PI_UR_SOURCE_DIR=${{github.workspace}}/ur-repo/"
+        --cmake-opt="-DSYCL_UR_USE_FETCH_CONTENT=OFF"
+        --cmake-opt="-DSYCL_UR_SOURCE_DIR=${{github.workspace}}/ur-repo/"
         --cmake-opt=-DCMAKE_C_COMPILER_LAUNCHER=ccache
         --cmake-opt=-DCMAKE_CXX_COMPILER_LAUNCHER=ccache