Remove unused QuotaSection.isFallback which is buggy

This is unused and was causing bugs since QuotaSection is used
as key in maps.

Change-Id: I167919de5d0eef86ccb750b993dc08a27a0504dd

src/main/java/com/googlesource/gerrit/plugins/quota/NamespacedQuotaSection.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/quota/NamespacedQuotaSection.java b/src/main/java/com/googlesource/gerrit/plugins/quota/NamespacedQuotaSection.java
index ad8a90c..7e7b516 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/quota/NamespacedQuotaSection.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/quota/NamespacedQuotaSection.java
@@ -47,9 +47,4 @@
   public String subSection() {
     return namespace();
   }
-
-  @Override
-  public boolean isFallbackQuota() {
-    return isFallBack;
-  }
 }

src/main/java/com/googlesource/gerrit/plugins/quota/QuotaFinder.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/quota/QuotaFinder.java b/src/main/java/com/googlesource/gerrit/plugins/quota/QuotaFinder.java
index 44d27c1..9d2d27b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/quota/QuotaFinder.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/quota/QuotaFinder.java
@@ -69,7 +69,7 @@
   }
 
   public QuotaSection getFallbackNamespacedQuota(Config cfg) {
-    return new NamespacedQuotaSection(cfg, "*", true);
+    return new NamespacedQuotaSection(cfg, "*");
   }
 
   public List<NamespacedQuotaSection> getQuotaNamespaces(Config cfg) {