Use MIN_LOCK_PASSWORD_SIZE as min password length.

Currently MIN_LOCK_PASSWORD_SIZE=MIN_LOCK_PATTERN_SIZE, so there
shouldn't be any behavior changes stemming from this.

Change-Id: I15369723e7fd0cc3fe8230c9b450faf929fefd00
diff --git a/src/com/android/settings/CryptKeeper.java b/src/com/android/settings/CryptKeeper.java
index 99c6e8b..1f331d7 100644
--- a/src/com/android/settings/CryptKeeper.java
+++ b/src/com/android/settings/CryptKeeper.java
@@ -888,7 +888,7 @@
             mPasswordEntry.setEnabled(false);
             setBackFunctionality(false);
 
-            if (password.length() >= LockPatternUtils.MIN_LOCK_PATTERN_SIZE) {
+            if (password.length() >= LockPatternUtils.MIN_LOCK_PASSWORD_SIZE) {
                 new DecryptTask().execute(password);
             } else {
                 // Allow user to make as many of these as they want.