[skip-ci] Packit: Fix action script for fetching upstream commit

This fixes multiple trailing quotes after the commit and also ensures
the older commit id will be correctly replaced by the newer id.

Signed-off-by: Lokesh Mandvekar <[email protected]>

Author: lsm5

.packit-rpm-git-commit.sh

@@ -14,4 +14,4 @@ SPEC_FILE=rpm/$PACKAGE.spec
 GIT_COMMIT=$(git rev-parse HEAD)
 
 # Update LDFLAGS to show commit id for Copr builds
-sed -i "s/^GIT_COMMIT=*/GIT_COMMIT=\"$GIT_COMMIT\"/" $SPEC_FILE
+sed -i "s/^GIT_COMMIT=.*/GIT_COMMIT=\"$GIT_COMMIT\"/" $SPEC_FILE