app-misc/watchexec: update format

- modify src_unpack() internally instead of redefining:
  functions should be defined on the order that they are called
  for more info, check:
  e19c6d5744 (commitcomment-172006236)

- fixed the long line which fixes the following pkgcheck error:
  app-misc/watchexec
    ExcessiveLineLength: version 2.3.2: excessive line length
    (over 120 characters) on line: 8

- used ${var} instead of $var which was recommended by negril

Signed-off-by: ingenarel <ingenarelitems@gmail.com>

app-misc/watchexec/watchexec-9999.ebuild

@@ -15,13 +15,9 @@ inherit cargo shell-completion
 DESCRIPTION="Executes commands in response to file modifications"
 HOMEPAGE="https://watchexec.github.io"
 
-if [[ "$PV" == 9999 ]]; then
+if [[ "${PV}" == 9999 ]]; then
 	inherit git-r3
 	EGIT_REPO_URI="https://github.com/watchexec/watchexec.git"
-	src_unpack() {
-		git-r3_src_unpack
-		cargo_live_src_unpack
-	}
 else
 	SRC_URI="https://github.com/watchexec/${PN}/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
 	SRC_URI+=" ${CARGO_CRATE_URIS}"
@@ -44,6 +40,15 @@ DOCS=( crates/cli/README.md )
 # update with proper path to binaries this crate installs, omit leading /
 QA_FLAGS_IGNORED="usr/bin/${PN}"
 
+src_unpack() {
+	if [[ "${PV}" == 9999 ]];then
+		git-r3_src_unpack
+		cargo_live_src_unpack
+	else
+		cargo_src_unpack
+	fi
+}
+
 src_compile() {
 	cargo_src_compile --manifest-path=crates/cli/Cargo.toml
 }