[macos] fix build script

Signed-off-by: r4sas <r4sas@i2pmail.org>

macos/build/build

@@ -58,7 +58,7 @@ if [ $? -ne 0 ]; then # Not found error, trying to cut language variable
 	fi
 fi
 
-if [ ! -f $file ]; then
+if [ ! -f "$file" ]; then
 	echo "[Error] Can't find downloaded file. Does it really exist?"
 	exit 1
 fi
@@ -75,8 +75,6 @@ else
 	rm SHA512SUMS
 fi
 
-exit
-
 echo "Attaching image and copying files..."
 hdiutil attach "$file"
 cp -r /Volumes/Firefox/Firefox.app ../FirefoxESR.app