Fix bootstrap-haskell for fish shell, fixes #48

bootstrap-haskell

@@ -235,7 +235,7 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 						if ! grep -q "ghcup-env" "${GHCUP_PROFILE_FILE}" ; then
 							echo "# ghcup-env" >> "${GHCUP_PROFILE_FILE}"
 							echo "set -q GHCUP_INSTALL_BASE_PREFIX[1]; or set GHCUP_INSTALL_BASE_PREFIX \$HOME" >> "${GHCUP_PROFILE_FILE}"
-							echo "test -f $GHCUP_DIR/env ; and set -gx PATH \$HOME/.cabal/bin $GHCUP_BIN/bin \$PATH" >> "${GHCUP_PROFILE_FILE}"
+							echo "test -f $GHCUP_DIR/env ; and set -gx PATH \$HOME/.cabal/bin $GHCUP_BIN \$PATH" >> "${GHCUP_PROFILE_FILE}"
 						fi
 						break ;;
 					*)