fix(formatNumber): handle small numbers correctly different gSize and lgSize

By using >= when comparing the number length to the lgSize we'll provide
the correct value when formatting numbers with differing lgSize and gSize

Closes angular#14289

Author: owencraig

src/ng/filter/filters.js

@@ -323,7 +323,7 @@ function formatNumber(number, pattern, groupSep, decimalSep, fractionSize) {
 
     // format the integer digits with grouping separators
     var groups = [];
-    if (digits.length > pattern.lgSize) {
+    if (digits.length >= pattern.lgSize) {
       groups.unshift(digits.splice(-pattern.lgSize).join(''));
     }
     while (digits.length > pattern.gSize) {

test/ng/filter/filtersSpec.js

@@ -35,7 +35,11 @@ describe('filters', function() {
 
     it('should format according to different patterns', function() {
       pattern.gSize = 2;
-      var num = formatNumber(1234567.89, pattern, ',', '.');
+      var num = formatNumber(99, pattern, ',', '.');
+      expect(num).toBe('99');
+      num = formatNumber(888, pattern, ',', '.');
+      expect(num).toBe('888');
+      num = formatNumber(1234567.89, pattern, ',', '.');
       expect(num).toBe('12,34,567.89');
       num = formatNumber(1234.56, pattern, ',', '.');
       expect(num).toBe('1,234.56');