use correct bash syntax to check exit code

.github/workflows/appimage.yml

@@ -77,7 +77,7 @@ jobs:
         id: jep-493-check
         run: |
           JMOD_PATHS="openjfx-jmods"
-          if ! $(${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"); then
+          if ! ${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"; then
             JMOD_PATHS="${JAVA_HOME}/jmods:${JMOD_PATHS}"
           fi
           echo "jmod_paths=${JMOD_PATHS}" >> "$GITHUB_OUTPUT"

.github/workflows/mac-dmg-x64.yml

@@ -79,7 +79,7 @@ jobs:
         id: jep-493-check
         run: |
           JMOD_PATHS="openjfx-jmods"
-          if ! $(${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"); then
+          if ! ${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"; then
             JMOD_PATHS="${JAVA_HOME}/jmods:${JMOD_PATHS}"
           fi
           echo "jmod_paths=${JMOD_PATHS}" >> "$GITHUB_OUTPUT"

.github/workflows/mac-dmg.yml

@@ -80,7 +80,7 @@ jobs:
         id: jep-493-check
         run: |
           JMOD_PATHS="openjfx-jmods"
-          if ! $(${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"); then
+          if ! ${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"; then
             JMOD_PATHS="${JAVA_HOME}/jmods:${JMOD_PATHS}"
           fi
           echo "jmod_paths=${JMOD_PATHS}" >> "$GITHUB_OUTPUT"

dist/linux/appimage/build.sh

@@ -54,7 +54,7 @@ fi
 # create runtime
 ## check for JEP 493
 JMOD_PATHS="openjfx-jmods"
-if ! $(${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"); then
+if ! ${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"; then
     JMOD_PATHS="${JAVA_HOME}/jmods:${JMOD_PATHS}"
 fi
 ## create runtime image

dist/mac/dmg/build.sh

@@ -78,7 +78,7 @@ cp ../../../target/${MAIN_JAR_GLOB} ../../../target/mods
 # create runtime
 ## check for JEP 493
 JMOD_PATHS="openjfx-jmods"
-if ! $(${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"); then
+if ! ${JAVA_HOME}/bin/jlink --help | grep -q "Linking from run-time image enabled"; then
     JMOD_PATHS="${JAVA_HOME}/jmods:${JMOD_PATHS}"
 fi
 ## create custom runtime