indexticker: fix rendering of 0.0x%

Any number that's 0.0x%, for example 0.09%, ends up rendering out as
`0.9%`. Fix this by using the humanize package's float() to do the hard
work for us.

apps/indexticker/index_ticker.star

@@ -12,6 +12,7 @@ v1.3 - Added NIKKEI, Europe 350, Global 100, Global 1200, NZX50 indices; support
 load("animation.star", "animation")
 load("encoding/json.star", "json")
 load("http.star", "http")
+load("humanize.star", "humanize")
 load("math.star", "math")
 load("render.star", "render")
 load("schema.star", "schema")
@@ -60,27 +61,9 @@ def main(config):
     Current = INDEX_JSON["chart"]["result"][0]["meta"]["regularMarketPrice"]
 
     PointsDiff = Current - LastClose
-    PercentDiff = PointsDiff / LastClose
-    StrPercentDiff = str(int(math.round(PercentDiff * 10000)))
-
-    # if % greater than 0
-    # elif % between 0 and -1
-    # elif % less than 0
-
-    if PercentDiff > 0:
-        StrPercentDiff = (StrPercentDiff[0:-2] + "." + StrPercentDiff[-2:])
-    elif PercentDiff > -0.01:
-        StrPercentDiff = StrPercentDiff.replace("-", "-0")
-        StrPercentDiff = (StrPercentDiff[0:-2] + "." + StrPercentDiff[-2:])
-    elif PercentDiff < 0:
-        StrPercentDiff = (StrPercentDiff[0:-2] + "." + StrPercentDiff[-2:])
-
-    if StrPercentDiff.startswith("."):
-        StrPercentDiff = "0" + StrPercentDiff
-        DiffColor = "#00ff00"
-    elif StrPercentDiff.startswith("-"):
-        StrPercentDiff = StrPercentDiff[1:]
-        StrPercentDiff = "-" + StrPercentDiff
+    PercentDiff = PointsDiff / LastClose * 100.0
+
+    if PercentDiff < 0:
         DiffColor = "#f00"
 
     if RangeSelection == "5m&range=1d":
@@ -97,8 +80,7 @@ def main(config):
         Interval = "YTD"
 
     if DisplaySelection == "true":
-        StrPercentDiff = StrPercentDiff + "%"
-        DisplayDiff = StrPercentDiff
+        DisplayDiff = humanize.float("#.##", PercentDiff) + "%"
     else:
         DisplayDiff = str(PointsDiff)[:6]