Fix quoting

Author: Thulium-Drake

docker/build.sh

@@ -81,12 +81,12 @@ CmakeGenerate() {
 
   if [ -n "$ENABLE_USERAPPS" ]
   then
-    CMAKE_ARGS=-DENABLE_USERAPPS=$ENABLE_USERAPPS
+    CMAKE_ARGS="-DENABLE_USERAPPS=$ENABLE_USERAPPS"
   fi
 
   if [ -n "$ENABLE_WATCHFACES" ]
   then
-    CMAKE_ARGS=${CMAKE_ARGS} -DENABLE_WATCHFACES=$ENABLE_WATCHFACES
+    CMAKE_ARGS="${CMAKE_ARGS} -DENABLE_WATCHFACES=$ENABLE_WATCHFACES"
   fi
 
   cmake -G "Unix Makefiles" \