lint: Fix minor shellcheck lints

zcutil/cleanup-tags.sh

@@ -15,7 +15,7 @@ i=0
 for nonzctag in $(git ls-remote origin \
                          | grep refs/tags/ \
                          | grep -v '\^{}$' \
-                         | sed 's,^.*refs/tags/,,'\
+                         | sed 's,^.*refs/tags/,,' \
                          | grep -Ev "$ZCASH_TAG_RGX"
                  )
 do

zcutil/fetch-params.sh

@@ -9,8 +9,9 @@ else
     PARAMS_DIR="$HOME/.zcash-params"
 fi
 
-SPROUT_PKEY_NAME='sprout-proving.key'
-SPROUT_VKEY_NAME='sprout-verifying.key'
+# Commented out because these are unused; see below.
+#SPROUT_PKEY_NAME='sprout-proving.key'
+#SPROUT_VKEY_NAME='sprout-verifying.key'
 SAPLING_SPEND_NAME='sapling-spend.params'
 SAPLING_OUTPUT_NAME='sapling-output.params'
 SAPLING_SPROUT_GROTH16_NAME='sprout-groth16.params'