test(uniswap): run the liquidity tests on the emulator instead of skipping them

These three were skipped whenever firmware_variant starts with "Emulator", and
the emulator is the only thing CI runs — so they have never executed in CI on
any branch. The firmware test report reads "327/330 PASSED, 3 skipped
(withheld)" with every EVM section green, and these are the 3.

The skip said "Skip until emulator issue resolved" and the comment above it
said "Pre-existing, unrelated to clear-signing" and "on-device this path is
exercised by the app". Both were wrong. Lifting the skip found a firmware logic
defect that fails on hardware too: confirmFromAccountMatch() in zxliquidtx.c
ended in `return is_self`, refusing the transaction AFTER the user approved the
recipient screen, so the device answered "Signing cancelled by user" for a
transaction the user had just confirmed.

The vectors show the split themselves — add_liquidity's recipient word is
commented "# eth address (self)" and passes; remove_liquidity's is
"# to address (not self)" and failed.

Fixed in keepkey-firmware as "fix(evm): a Uniswap recipient screen the user
approved is an approval". Against that firmware all three pass, asserting their
exact sig_v/sig_r/sig_s, so the device is signing the right bytes.

Keeping the skip would keep the report green by not looking.

Author: BitHighlander

tests/test_msg_ethereum_erc20_uniswap_liquidity.py

@@ -29,13 +29,6 @@ class TestMsgEthereumUniswaptxERC20(common.KeepKeyTest):
 
     def test_sign_uni_approve_liquidity_ETH(self):
         self.requires_fullFeature()
-        if self.client.features.firmware_variant[0:8] == "Emulator":
-            # Approving an UNKNOWN token contract (the FOX pool, not in the
-            # token table) does not complete on the emulator — same limitation
-            # as test_sign_uni_add_liquidity_ETH below. Known-token approves
-            # (test_msg_ethereum_erc20_approve) pass here; on-device this path
-            # is exercised by the app. Pre-existing, unrelated to clear-signing.
-            self.skipTest("Skip until emulator issue resolved")
         self.requires_firmware("7.1.0")
         self.setup_mnemonic_nopin_nopassphrase()
 
@@ -62,9 +55,6 @@ def test_sign_uni_approve_liquidity_ETH(self):
 
     def test_sign_uni_add_liquidity_ETH(self):
         self.requires_fullFeature()
-        if self.client.features.firmware_variant[0:8] == "Emulator":
-            self.skipTest("Skip until emulator issue resolved")
-            return
         self.requires_firmware("7.1.0")
         self.setup_mnemonic_nopin_nopassphrase()
 
@@ -94,9 +84,6 @@ def test_sign_uni_add_liquidity_ETH(self):
 
     def test_sign_uni_remove_liquidity_ETH(self):
         self.requires_fullFeature()
-        if self.client.features.firmware_variant[0:8] == "Emulator":
-            self.skipTest("Skip until emulator issue resolved")
-            return
         self.requires_firmware("7.1.0")
         self.setup_mnemonic_nopin_nopassphrase()