cm: Also Bump GSM Hero to RC4

Is there any reason to not have this one use the same RC than the others?

Change-Id: Ie2c06b685ed229e620d5ecb9bf54ab67c7fb43d0
diff --git a/products/cyanogen_hero.mk b/products/cyanogen_hero.mk
index 6113e58..c32e9ea 100644
--- a/products/cyanogen_hero.mk
+++ b/products/cyanogen_hero.mk
@@ -32,10 +32,10 @@
 else
     ifdef CYANOGEN_RELEASE
         PRODUCT_PROPERTY_OVERRIDES += \
-            ro.modversion=CyanogenMod-7.0.0-RC0-Hero
+            ro.modversion=CyanogenMod-7.0.0-RC4-Hero
     else
         PRODUCT_PROPERTY_OVERRIDES += \
-            ro.modversion=CyanogenMod-7.0.0-RC0-Hero-KANG
+            ro.modversion=CyanogenMod-7.0.0-RC4-Hero-KANG
     endif
 endif