CI: re-enable checks, by changing errant tab back to spaces.

FFS GH!

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

.github/workflows/ci.yaml

@@ -31,7 +31,7 @@ jobs:
           - CFG: "make-EXPERIMENTAL-check w/ VALGRIND"
             TEST_CMD: "make check-source check-units installcheck check-gen-updated"
             EXPERIMENTAL_FEATURES: 1
-	    VALGRIND: 1
+            VALGRIND: 1
     steps:
       - name: Checkout
         uses: actions/[email protected]