golang: install into lib instead of share

golang: install into lib instead of share

Installing into share and symlinking to lib breaks tests:

--- FAIL: TestAllDependencies (0.01s)

    moddeps_test.go:49: findGorootModules didn't find the well-known module "std"

--- FAIL: TestDependencyVersionsConsistent (0.00s)

    moddeps_test.go:356: findGorootModules didn't find the well-known module "std"

Install into lib directly instead.

Fixes: c137c382 ("golang: new packages")
Link: https://github.com/openwrt/packages/pull/28445
Signed-off-by: George Sapkin <redacted>