Rename blame-cache lib target to 'blame-cache'

The name is currently 'lib' which results in 'liblib.jar' being
generated.

Change it so the generated file is 'libblame-cache' which is more
meaningful.

Change-Id: I5f735b0b85592b883a14dadbb0c63be7f8014fe4

tools/maven/BUILD

diff --git a/tools/maven/BUILD b/tools/maven/BUILD
index defb13a..5efc003 100644
--- a/tools/maven/BUILD
+++ b/tools/maven/BUILD
@@ -3,7 +3,7 @@
 
 maven_package(
     src = {
-        "blame-cache": "//blame-cache:liblib-src.jar",
+        "blame-cache": "//blame-cache:libblame-cache-src.jar",
         "gitiles-servlet": "//gitiles-servlet:libservlet-src.jar",
     },
     doc = {
@@ -12,7 +12,7 @@
     },
     group = "com.google.gitiles",
     jar = {
-        "blame-cache": "//blame-cache:lib",
+        "blame-cache": "//blame-cache:blame-cache",
         "gitiles-servlet": "//gitiles-servlet:servlet",
     },
     repository = "gerrit-maven-repository",