SAK-32445 Fix Assignments Grading with ".X" Grades (sakaiproject#4250)

When an assignment was saved with a grade such as ".7" with less
than the number of allowed decimal places (2 is default), the grade was
saved as "0.07"). This changes causes it to be saved as "0.70" by
padding entered scores with trailing 0s as appropriate.

assignment/assignment-tool/tool/src/java/org/sakaiproject/assignment/tool/AssignmentAction.java

@@ -15097,8 +15097,16 @@ private String scalePointGrade(SessionState state, String point, int factor)
 				{
 					if (index == 0)
 					{
+						int trailingData = point.substring(1).length();
 						// if the point is the first char, add a 0 for the integer part
 						point = "0".concat(point.substring(1));
+						// ensure that the point value has the correct # of decimals
+						// by padding with zeros
+						if(trailingData < dec) {
+							for(int i = trailingData; i < dec; i++) {
+								point = point + "0";
+							}
+						}
 					}
 					else if (index < point.length() - 1)
 					{