Fix the temp MLT version pin

Author: ddennedy

.github/workflows/build-linux.yml

@@ -28,8 +28,8 @@ jobs:
           echo CLEANUP=0 > build-shotcut.conf
           echo SHOTCUT_VERSION=\"$VERSION\" >> build-shotcut.conf
 
-          echo MLT_HEAD=0 > build-shotcut.conf
-          echo MLT_REVISION=8988ffd6677a89445e6307ba7035241abbce3a70  > build-shotcut.conf
+          echo MLT_HEAD=0 >> build-shotcut.conf
+          echo MLT_REVISION=8988ffd6677a89445e6307ba7035241abbce3a70 >> build-shotcut.conf
 
           docker run -v $PWD:/root/shotcut $IMAGE_NAME
           echo Renaming build artifacts

.github/workflows/build-sdk-windows.yml

@@ -87,6 +87,10 @@ jobs:
           echo SHOTCUT_VERSION=\"$VERSION\" >> build-shotcut.conf
           echo ENABLE_GLAXNIMATE=0 >> build-shotcut.conf
           echo DEBUG_BUILD=1 >> build-shotcut.conf
+
+          echo MLT_HEAD=0 >> build-shotcut.conf
+          echo MLT_REVISION=8988ffd6677a89445e6307ba7035241abbce3a70 >> build-shotcut.conf
+
           bash scripts/build-shotcut-msys2.sh -s
           mv build/shotcut-sdk.txz build/shotcut-win64-sdk-$FILENAME_VERSION.txz
           echo Done

.github/workflows/build-windows.yml

@@ -91,8 +91,8 @@ jobs:
           echo INSTALL_DIR=\"$CHECKOUT_DIR/build\" > build-shotcut.conf
           echo SHOTCUT_VERSION=\"$VERSION\" >> build-shotcut.conf
 
-          echo MLT_HEAD=0 > build-shotcut.conf
-          echo MLT_REVISION=8988ffd6677a89445e6307ba7035241abbce3a70  > build-shotcut.conf
+          echo MLT_HEAD=0 >> build-shotcut.conf
+          echo MLT_REVISION=8988ffd6677a89445e6307ba7035241abbce3a70 >> build-shotcut.conf
 
           bash scripts/build-shotcut-msys2.sh
           pushd build