Squash redundant string concatenations introduced by google-java-format

Reformatting the code with google-java-format tool in change Id5f3c6de9
resulted in wrapped lines being unwrapped to the new 100 columns limit.

In cases where the wrapped line was wrapped on a string concatenation,
the resulting long line now includes redundant concatenations. See the
upstream issue [1] for an example of this.

Squash the redundant concatenations with:

  git ls-files | grep java$ | xargs sed -i '' 's/" + "//g'

(note: this also resulted in a couple of unwanted changes; those are
manually undone.)

[1] https://github.com/google/google-java-format/issues/122

Change-Id: I7348413ae460c8c7a0b0c72dab0a1ae7275a2ec3

gerrit-war/src/main/java/com/google/gerrit/httpd/SitePathFromSystemConfigProvider.java

@@ -49,7 +49,7 @@ class SitePathFromSystemConfigProvider implements Provider<Path> {
           throw new OrmException("system_config table is empty");
         default:
           throw new OrmException(
-              "system_config must have exactly 1 row;" + " found " + all.size() + " rows instead");
+              "system_config must have exactly 1 row; found " + all.size() + " rows instead");
       }
     }
   }