[get-modified-image.sh] Replace tabs with spaces (tabs are evil)

(and with spaces it's easier to copy-paste in a console for debugging)

get-modified-image.sh

@@ -7,12 +7,12 @@
 RES=""
 for i in $(git log -m -1 --name-only --pretty="format:" --first-parent)
 do
-	case "$i" in
-		*pica*|*meta*)
-			RES=$(echo $i | cut -d '/' -f1)
-			break
-			;;
-	esac
+  case "$i" in
+    *pica*|*meta*)
+      RES=$(echo $i | cut -d '/' -f1)
+      break
+      ;;
+  esac
 done
 echo "export MODIFIED_IMAGE=${RES}" > variables